Do not adjust oom_score when renderer is discarded
Do not adjust oom_score when renderer is discarded

If pid is zero, renderer process is not existed.
It is discarded. So, we don't need to adjust oom_score

BUG=151442
TEST=Compile


Review URL: https://chromiumcodereview.appspot.com/10961018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@157912 0039d316-1c4b-4281-b951-d872f2087c98

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