[Mac] Don't fade text on bookmark items if we don't have to.
[Mac] Don't fade text on bookmark items if we don't have to.

Fix a float <-> int comparison so items whose width is fractionally larger than the width of the cell aren't truncated.

BUG=51183
TEST=See bug

Review URL: http://codereview.chromium.org/3096007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55305 0039d316-1c4b-4281-b951-d872f2087c98

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