Fix a ChromeFrame crash reported on the crash server while processing an accelerator message. The crash happens while invoking the IBrowserService2::v_MayTranslateAccelerator function. It appears from the dump that there are cases in IE8 where this interface is actually implemented, but this function entry is NULL in the vtable. In any case from the comments in the code this interface is only implemented till IE7. 
Fix a ChromeFrame crash reported on the crash server while processing an accelerator message. The crash happens while invoking the
IBrowserService2::v_MayTranslateAccelerator function. It appears from the dump that there are cases in IE8 where this interface
is actually implemented, but this function entry is NULL in the vtable. In any case from the comments in the code this interface
is only implemented till IE7. 

Fixes bug http://code.google.com/p/chromium/issues/detail?id=25457

Bug=25457

Review URL: http://codereview.chromium.org/1718019

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@45831 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser