Fix netsim test after webkit r132252.
Fix netsim test after webkit r132252.

That patch changed it so that timeout cannot be set on synchronous XHRs. Doing
so caused an exception which caused the test to hang. Example:
http://build.chromium.org/p/chromium.perf/builders/Linux%20Perf%20%281%29/builds/16655/steps/page_cycler_2012Q2-netsim/logs/stdio

BUG=None
TEST=Manual on linux

Review URL: https://codereview.chromium.org/11269009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@163899 0039d316-1c4b-4281-b951-d872f2087c98

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