Fix for crash bug in PluginProcessHost::OnGetCookies - it likes like this can be called when we don't have a URLContext from which to return cookies. 
Fix for crash bug in PluginProcessHost::OnGetCookies - it likes like this can be called when we don't have a URLContext from which to return cookies. 

Previously we crashed, this patch just logs an error and returns an empty string instead. 

BUG=http://crbug.com/10706


Review URL: http://codereview.chromium.org/171050

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@23568 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,adobe/chromium