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This adds default implementations to the Cocoa and Gtk shell windows. The views shell window is currently the only class that implements these in a non-default way; the Cocoa and Gtk will get their own implementations in a follow-up patch.

This is needed to have the app window setBounds() and getBounds() APIs operate
on content bounds rather than window frame bounds.

R=ben@chromium.org,rsesek@chromium.org,estade@chromium.org

Review URL: https://chromiumcodereview.appspot.com/11369237

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170713 0039d316-1c4b-4281-b951-d872f2087c98