Fix bump-scroll on Windows.
Fix bump-scroll on Windows.

BUG=132104
TEST=Manual

Review URL: https://chromiumcodereview.appspot.com/10537113

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@141765 0039d316-1c4b-4281-b951-d872f2087c98

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