[Mac] Do not draw pinned tab favicons on half pixels.
[Mac] Do not draw pinned tab favicons on half pixels.

BUG=96490
TEST=Pin a tab and inspect the icon. It's not blurry/fuzzy.


Review URL: http://codereview.chromium.org/7969017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@102416 0039d316-1c4b-4281-b951-d872f2087c98

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