GTK: Allow resizing the findbar when the window is narrow.
GTK: Allow resizing the findbar when the window is narrow.

BUG=none
TEST=manual (made sure it pixel-matched the old find bar, in both normal and GTK+ theme modes)

Review URL: http://codereview.chromium.org/6992017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86637 0039d316-1c4b-4281-b951-d872f2087c98

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