Fixes crash on double clicking in the upper right corner of the window. For some reason gtk_window_begin_move_drag crashes when invoked for double/triple clicks.
Fixes crash on double clicking in the upper right corner of the
window. For some reason gtk_window_begin_move_drag crashes when
invoked for double/triple clicks.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/434045

git-svn-id: http://src.chromium.org/svn/trunk/src@32976 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8b61b38cb102958ce704357c2b75b9b03bdad270
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