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the same cleanup code as browser_window_gtk.

Also fix a leak of the gtk widgets when the accelerator was
not used for the task manager.  If the user closed by using the
window manager destroy, then we never called gtk_widget_destroy
on the window and leaked the widgets.

Review URL: http://codereview.chromium.org/202035


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25897 0039d316-1c4b-4281-b951-d872f2087c98