Set SDKROOT in the project-wide xcode_settings block instead of doing it in target_defaults.  This is equivalent to how Xcode sets SDKROOT from the Project Info window's General tab.  Making this setting project-wide means that the selected SDK will show up properly in that UI.
Set SDKROOT in the project-wide xcode_settings block instead of doing it in
target_defaults.  This is equivalent to how Xcode sets SDKROOT from the
Project Info window's General tab.  Making this setting project-wide means
that the selected SDK will show up properly in that UI.

BUG=26976
TEST=Build still works.
     SDK (typically "Mac OS X 10.5") shows up in Project Info:General.
Review URL: http://codereview.chromium.org/371035

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@31307 0039d316-1c4b-4281-b951-d872f2087c98

hgl888/chromium-crosswalk,Chilledheart/chromium,krieger-od/nwjs_chromium.src,ChromiumWebApps/chromium,mohamed--abdel-maksoud/chromium.src,rogerwang/chromium,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,timopulkkinen/BubbleFish,nacl-webkit/chrome_deps,robclark/chromium,timopulkkinen/BubbleFish,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,patrickm/chromium.src,ondra-novak/chromium.src,mohamed--abdel-maksoud/chromium.src,Pluto-tv/chromium-crosswalk,keishi/chromium,chuan9/chromium-crosswalk,littlstar/chromium.src,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,Pluto-tv/chromium-crosswalk,hujiajie/pa-chromium,hgl888/chromium-crosswalk,littlstar/chromium.src,robclark/chromium,Fireblend/chromium-crosswalk,ondra-novak/chromium.src,crosswalk-project/chromium-crosswalk-efl,ltilve/chromium,crosswalk-project/chromium-crosswalk-efl,dushu1203/chromium.src,rogerwang/chromium,ChromiumWebApps/chromium,timopulkkinen/BubbleFish,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk,Chilledheart/chromium,patrickm/chromium.src,Jonekee/chromium.src,Fireblend/chromium-crosswalk,pozdnyakov/chromium-crosswalk,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,anirudhSK/chromium,Jonekee/chromium.src,ondra-novak/chromium.src,dushu1203/chromium.src,axinging/chromium-crosswalk,rogerwang/chromium,Fireblend/chromium-crosswalk,Jonekee/chromium.src,dushu1203/chromium.src,patrickm/chromium.src,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,Jonekee/chromium.src,dushu1203/chromium.src,dednal/chromium.src,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,keishi/chromium,Chilledheart/chromium,ltilve/chromium,robclark/chromium,M4sse/chromium.src,keishi/chromium,crosswalk-project/chromium-crosswalk-efl,rogerwang/chromium,dednal/chromium.src,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,ondra-novak/chromium.src,Jonekee/chromium.src,dushu1203/chromium.src,crosswalk-project/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,rogerwang/chromium,mohamed--abdel-maksoud/chromium.src,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,timopulkkinen/BubbleFish,junmin-zhu/chromium-rivertrail,anirudhSK/chromium,junmin-zhu/chromium-rivertrail,patrickm/chromium.src,Chilledheart/chromium,Chilledheart/chromium,zcbenz/cefode-chromium,M4sse/chromium.src,bright-sparks/chromium-spacewalk,timopulkkinen/BubbleFish,timopulkkinen/BubbleFish,nacl-webkit/chrome_deps,fujunwei/chromium-crosswalk,dednal/chromium.src,fujunwei/chromium-crosswalk,markYoungH/chromium.src,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,timopulkkinen/BubbleFish,pozdnyakov/chromium-crosswalk,axinging/chromium-crosswalk,M4sse/chromium.src,junmin-zhu/chromium-rivertrail,Just-D/chromium-1,fujunwei/chromium-crosswalk,mogoweb/chromium-crosswalk,ondra-novak/chromium.src,TheTypoMaster/chromium-crosswalk,rogerwang/chromium,ltilve/chromium,PeterWangIntel/chromium-crosswalk,mogoweb/chromium-crosswalk,anirudhSK/chromium,bright-sparks/chromium-spacewalk,ltilve/chromium,dednal/chromium.src,hgl888/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,littlstar/chromium.src,ltilve/chromium,mogoweb/chromium-crosswalk,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,zcbenz/cefode-chromium,robclark/chromium,Chilledheart/chromium,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,pozdnyakov/chromium-crosswalk,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,fujunwei/chromium-crosswalk,krieger-od/nwjs_chromium.src,dednal/chromium.src,hujiajie/pa-chromium,keishi/chromium,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,anirudhSK/chromium,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk-efl,ltilve/chromium,jaruba/chromium.src,Fireblend/chromium-crosswalk,hujiajie/pa-chromium,pozdnyakov/chromium-crosswalk,keishi/chromium,anirudhSK/chromium,keishi/chromium,fujunwei/chromium-crosswalk,ChromiumWebApps/chromium,pozdnyakov/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,dednal/chromium.src,zcbenz/cefode-chromium,patrickm/chromium.src,bright-sparks/chromium-spacewalk,Just-D/chromium-1,nacl-webkit/chrome_deps,chuan9/chromium-crosswalk,rogerwang/chromium,Jonekee/chromium.src,Jonekee/chromium.src,mohamed--abdel-maksoud/chromium.src,krieger-od/nwjs_chromium.src,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk,hujiajie/pa-chromium,jaruba/chromium.src,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,Pluto-tv/chromium-crosswalk,timopulkkinen/BubbleFish,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,Pluto-tv/chromium-crosswalk,anirudhSK/chromium,axinging/chromium-crosswalk,M4sse/chromium.src,jaruba/chromium.src,robclark/chromium,Chilledheart/chromium,junmin-zhu/chromium-rivertrail,junmin-zhu/chromium-rivertrail,hgl888/chromium-crosswalk-efl,Just-D/chromium-1,nacl-webkit/chrome_deps,ltilve/chromium,ondra-novak/chromium.src,M4sse/chromium.src,littlstar/chromium.src,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,mogoweb/chromium-crosswalk,dednal/chromium.src,hgl888/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,nacl-webkit/chrome_deps,axinging/chromium-crosswalk,ondra-novak/chromium.src,hujiajie/pa-chromium,ChromiumWebApps/chromium,M4sse/chromium.src,ChromiumWebApps/chromium,mogoweb/chromium-crosswalk,patrickm/chromium.src,Fireblend/chromium-crosswalk,hujiajie/pa-chromium,hujiajie/pa-chromium,PeterWangIntel/chromium-crosswalk,fujunwei/chromium-crosswalk,pozdnyakov/chromium-crosswalk,junmin-zhu/chromium-rivertrail,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,zcbenz/cefode-chromium,markYoungH/chromium.src,nacl-webkit/chrome_deps,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,junmin-zhu/chromium-rivertrail,crosswalk-project/chromium-crosswalk-efl,mogoweb/chromium-crosswalk,jaruba/chromium.src,junmin-zhu/chromium-rivertrail,zcbenz/cefode-chromium,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,ChromiumWebApps/chromium,timopulkkinen/BubbleFish,chuan9/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,mogoweb/chromium-crosswalk,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,jaruba/chromium.src,markYoungH/chromium.src,rogerwang/chromium,ChromiumWebApps/chromium,pozdnyakov/chromium-crosswalk,M4sse/chromium.src,Just-D/chromium-1,Pluto-tv/chromium-crosswalk,markYoungH/chromium.src,ltilve/chromium,ondra-novak/chromium.src,hgl888/chromium-crosswalk,dushu1203/chromium.src,hgl888/chromium-crosswalk,hujiajie/pa-chromium,pozdnyakov/chromium-crosswalk,hgl888/chromium-crosswalk-efl,fujunwei/chromium-crosswalk,junmin-zhu/chromium-rivertrail,M4sse/chromium.src,zcbenz/cefode-chromium,anirudhSK/chromium,robclark/chromium,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,Just-D/chromium-1,junmin-zhu/chromium-rivertrail,M4sse/chromium.src,pozdnyakov/chromium-crosswalk,Just-D/chromium-1,keishi/chromium,hgl888/chromium-crosswalk-efl,markYoungH/chromium.src,jaruba/chromium.src,bright-sparks/chromium-spacewalk,mogoweb/chromium-crosswalk,jaruba/chromium.src,keishi/chromium,ChromiumWebApps/chromium,littlstar/chromium.src,axinging/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,jaruba/chromium.src,dednal/chromium.src,keishi/chromium,krieger-od/nwjs_chromium.src,nacl-webkit/chrome_deps,chuan9/chromium-crosswalk,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,patrickm/chromium.src,nacl-webkit/chrome_deps,pozdnyakov/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,pozdnyakov/chromium-crosswalk,nacl-webkit/chrome_deps,zcbenz/cefode-chromium,markYoungH/chromium.src,Just-D/chromium-1,PeterWangIntel/chromium-crosswalk,zcbenz/cefode-chromium,markYoungH/chromium.src,fujunwei/chromium-crosswalk,dushu1203/chromium.src,anirudhSK/chromium,dushu1203/chromium.src,jaruba/chromium.src,robclark/chromium,patrickm/chromium.src,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,markYoungH/chromium.src,littlstar/chromium.src,dushu1203/chromium.src,hujiajie/pa-chromium,hujiajie/pa-chromium,zcbenz/cefode-chromium,TheTypoMaster/chromium-crosswalk,hujiajie/pa-chromium,Pluto-tv/chromium-crosswalk,dednal/chromium.src,mogoweb/chromium-crosswalk,littlstar/chromium.src,rogerwang/chromium,Fireblend/chromium-crosswalk,nacl-webkit/chrome_deps,timopulkkinen/BubbleFish,bright-sparks/chromium-spacewalk,anirudhSK/chromium,dushu1203/chromium.src,markYoungH/chromium.src,bright-sparks/chromium-spacewalk,Chilledheart/chromium,ChromiumWebApps/chromium,keishi/chromium,Chilledheart/chromium,rogerwang/chromium,chuan9/chromium-crosswalk,zcbenz/cefode-chromium,anirudhSK/chromium,hgl888/chromium-crosswalk,keishi/chromium,anirudhSK/chromium,Pluto-tv/chromium-crosswalk,Just-D/chromium-1,mogoweb/chromium-crosswalk,robclark/chromium,nacl-webkit/chrome_deps,robclark/chromium,hgl888/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,fujunwei/chromium-crosswalk,dednal/chromium.src,dushu1203/chromium.src,zcbenz/cefode-chromium,patrickm/chromium.src,ltilve/chromium,anirudhSK/chromium,ondra-novak/chromium.src,robclark/chromium,chuan9/chromium-crosswalk,littlstar/chromium.src