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It turns out Chrome doesn't have a minimum requirement of SSE yet,
so we can't rely on __SSE__ being set at compile time.  To use SSE
code we need to put it in a separate GYP target compiled with -msse.

This patch set does exactly that for vector_fmac::FMAC_SSE() and
SincResampler::Convolve_SSE().  Doing so required some slight
rearrangements of constants for SincResampler.

Given all of our bots should have SSE I've made it a requirement
for passing the tests when run on X86.

BUG=none
TEST=media_unittests

Review URL: https://codereview.chromium.org/12478002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186285 0039d316-1c4b-4281-b951-d872f2087c98