bash 4.0 compatibility for .keystone_install. In bash 4.0, "declare VAR" no longer initializes VAR if not already set.
bash 4.0 compatibility for .keystone_install. In bash 4.0, "declare VAR" no
longer initializes VAR if not already set.

BUG=83180
TEST=Run .keystone_install under bash 4.0 or newer (4.2.10 is current)
Review URL: http://codereview.chromium.org/7050012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@85947 0039d316-1c4b-4281-b951-d872f2087c98

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