grit_info: Explicitly make __file__ relative to the current directory.
grit_info: Explicitly make __file__ relative to the current directory.

__file__ is relative if grit_info is called like `python ../tools/grit/grit_info.py`,
but not if it's invoked from python code like `import grit_info; grit_info.DoMain()`.
And that confuses the xcode project generator, which will complain about hash
collisions if these paths are serialized in absolute form.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7066030

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86551 0039d316-1c4b-4281-b951-d872f2087c98

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