Linux: switch to using the system libraries in some cases.
Linux: switch to using the system libraries in some cases.

Previously we built our own copies of many common system libraries.
This comes from our Windows history, where these libraries have to be
carried by any application using them because they aren't provided as
standard.

On Linux, however, they are ubiqutous so we can save binary size by
dynamically linking against the system versions.

TEST=none
BUG=29738

http://codereview.chromium.org/465126

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@34084 0039d316-1c4b-4281-b951-d872f2087c98

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