Fix crash 12519: in views::DialogClientView::AcceptWindow()
Fix crash 12519: in views::DialogClientView::AcceptWindow()

We don't have repro steps for this crash so this
is a blind fix.

But looking at the function that crashes and the
history of this file I see:

Ben's r11070 and r11047: Which add this check.
Ben's r11132: Which removes this check (according
to the comments it is a test to see if we can get
away with it).

It looks to me like the check would prevent the
crash and since this is still crashing, I am
proposing we re-add it.

BUG=12519
TEST=We'll need to verify this by checking the
crash dumps sent from the field.

Review URL: http://codereview.chromium.org/119183

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@17651 0039d316-1c4b-4281-b951-d872f2087c98

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