Remove the coordinate hack for zoomed plugin pages on the Mac.
Remove the coordinate hack for zoomed plugin pages on the Mac.

Now that the underlying bug is fixed, the relative coordinates can be trusted regardless of zoom level.

BUG=51078
TEST=Mouseovers should still work in all plugins on the Mac.

Review URL: http://codereview.chromium.org/3072026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55099 0039d316-1c4b-4281-b951-d872f2087c98

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