Remove 1px of grey at the bottom of the render view.
Remove 1px of grey at the bottom of the render view.

It was a part of extension shelf not hiding fully.

TEST=On Linux, open any website with links and mouse hover over any link. There should be no gap between the status bubble and the bottom of the window.
http://crbug.com/17324

Review URL: http://codereview.chromium.org/155934

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@21314 0039d316-1c4b-4281-b951-d872f2087c98

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