GTK Themes: Fixes button state on pressed back/forward buttons and toolbar items.

This patch fixes two related problems:

1) Holding down back/forward now stay pressed while the menu is shown.
2) Buttons on the "toolbar" now emulate GTK's toolbar behaviour of only showing
   the border on hover.

http://crbug.com/17308
http://crbug.com/17340

Review URL: http://codereview.chromium.org/159154

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@21233 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed