Remove unconditional -msse3 -mssse3 CFLAGS from media.gyp.
Remove unconditional -msse3 -mssse3 CFLAGS from media.gyp.

This is confirmed to work by a user who experienced
the crash on illegal instruction because of this,
https://bugs.gentoo.org/show_bug.cgi?id=401537#c27

BUG=107532

Review URL: http://codereview.chromium.org/9309075

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@120485 0039d316-1c4b-4281-b951-d872f2087c98

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