Remove default argument to Results.File() to ease refactoring.
Remove default argument to Results.File() to ease refactoring.

I may need to add support for 'existing file tested for existence but never
opened' so I'll need to add another flag to the constructor. This is because
some tests rely on files being present but they are never read. *Sigh*.

TBR=cmp@chromium.org
NOTRY=true
BUG=
TEST=


Review URL: https://chromiumcodereview.appspot.com/10736002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@145610 0039d316-1c4b-4281-b951-d872f2087c98

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