Avoid leaks at shutdown when running purify
Avoid leaks at shutdown when running purify

We'll risk a (rare) crash under purify, but avoid having a leak detected.

Note that this "leak" at shutdown is NBD, but this code at least shows
that the would be leak is "understood" and acceptable.

bug=6532
r=erikkay
Review URL: http://codereview.chromium.org/42083

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@11473 0039d316-1c4b-4281-b951-d872f2087c98

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