[Mac] Convert Omnibox border to bezier paths.
[Mac] Convert Omnibox border to bezier paths.

In preparation for rounding the corners.  Doing this in two pieces
because the difference between NSFrameRect*() and framing a rectangle
using NSBezierPath is a little subtle.

BUG=45762
TEST=Omnibox should look identical.

Review URL: http://codereview.chromium.org/2828008

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@50042 0039d316-1c4b-4281-b951-d872f2087c98

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