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easier for callers. Also gets bookmark menu button to compile.

I'm also removing a function I just added to gtk_util as it's not
needed. GTK offers gtk_widget_get_toplevel which does what I need.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/115831

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17029 0039d316-1c4b-4281-b951-d872f2087c98