Mac: Align tabpose titles on pixel boundaries, making them less blurry.
Mac: Align tabpose titles on pixel boundaries, making them less blurry.

Also align favicon and title at their vertical center instead of at the baseline to match the tab look.

BUG=50307
TEST=Open tabpose. Titles shouldn't be blurry.

Review URL: http://codereview.chromium.org/5729001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@68753 0039d316-1c4b-4281-b951-d872f2087c98

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