gtk: Clip the tab title to the content height and not the font height.  The font height is a design measure and should not be used for a bounding box.
gtk: Clip the tab title to the content height and not the font height.  The font height is a design measure and should not be used for a bounding box.

BUG=20401
TEST=Open google.com in a tab.  Tab title should be fully visible and not clipped.
Review URL: http://codereview.chromium.org/179022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@24765 0039d316-1c4b-4281-b951-d872f2087c98

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