Make extension shelf resize correctly with the window.
Make extension shelf resize correctly with the window.

I just changed the shelf to autosize horizontally and to be anchored at the bottom and the left and right sides in IB (it was anchored to the top left before and had no autoresizing).

BUG=none
TEST=Enable extension shelf in browser_window_controller.mm (turn #if 0 into #if 1), then build & start chromium. Resize the browser window. The shelf should now stay at the bottom of the window and stay sane.

Review URL: http://codereview.chromium.org/208023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@26568 0039d316-1c4b-4281-b951-d872f2087c98

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