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only use the KWin hack when the custom frame is enabled.

This is still a bit buggy in KWin (toggling from custom frame -> system
decorations doesn't always re-attach system decorations), but it seems
like the best I can do.

Review URL: http://codereview.chromium.org/155248


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20199 0039d316-1c4b-4281-b951-d872f2087c98