Fix for DWM crash.
Fix for DWM crash.

BUG=13075
TBR=ben
TEST=On XP, verify that Chrome doesn't crash when a theme is installed or reset.

Review URL: http://codereview.chromium.org/118252

git-svn-id: http://src.chromium.org/svn/trunk/src@17652 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8de6ed9849316daca8799672cdd76fb9a93a5350
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