Potential fix for http://crbug.com/13111
Potential fix for http://crbug.com/13111

The browser_window_controller is destroyed before the window is destroyed.
In its dealloc, it sends the download shelf an |exiting| message that deletes
all item controllers, but the items's views might still be visible and hold
weak references to their controllers. When they are clicked, they would se
nd a message to free'd memory.

This is all speculation.

BUG=13111
TEST=Release to dev channel, monitor crash reports. Should go down.

Review URL: http://codereview.chromium.org/193109

git-svn-id: http://src.chromium.org/svn/trunk/src@26198 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: fcab4aedd60be6b49a47449f338a92d740b7426a
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