Fix browser crash.
Fix browser crash.

BUG=34147
TEST=Fewer crash reports in RenderWidgetHost::ForwardInputEvent

Review URL: http://codereview.chromium.org/598005

git-svn-id: http://src.chromium.org/svn/trunk/src@38446 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c78768dd8882e27803ae3589b837e4b57aeee1cc
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser