Disable SSSE3 version of RGB->YUV conversion.
Disable SSSE3 version of RGB->YUV conversion.

Temporarily disable SSSE3 version of color conversion. It caused
a color shift problem on edges of text. We should switch back to
SSSE3 version when the problem is resolved.

BUG=100462
TEST=Run chromoting and see the quality improvement

Review URL: http://codereview.chromium.org/8306005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105782 0039d316-1c4b-4281-b951-d872f2087c98

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