GTK find bar positioning: Don't try to make a negative-width rectangle.
GTK find bar positioning: Don't try to make a negative-width rectangle.

BUG=none
TEST=make your browser very narrow in debug mode, it doesn't crash

Review URL: http://codereview.chromium.org/159665

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@22117 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser