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: http://src.chromium.org/svn/trunk/src@24765 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f4029e4a7abbeb3863438e93502bd9f03c20db43
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser