Add a call to MemoryDebug::MarkAsInitialized to the new network code to avoid false UMR reports from Purify due to asynchronous filling of memory from the  socket.
Add a call to MemoryDebug::MarkAsInitialized to the new network code to avoid
false UMR reports from Purify due to asynchronous filling of memory from the 
socket.

BUG=5297
TEST=run test_shell.exe http://localhost:8080/multipart/invalid-image-data-standalone.html
  in Purify, see no UMRs in net code.  Or watch the layout-test Purify
  buildbot running http/tests/invalid-image-data{-standalone}.html
Review URL: http://codereview.chromium.org/13331

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@7028 0039d316-1c4b-4281-b951-d872f2087c98

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