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We're not ready for this in M32:
  * The Windows compiler doesn't support vector code so we're using generic
    code there.
  * We don't have promotion for AES-GCM ciphersuites when AES-NI is supported.

This change is designed to be reverted on trunk once M32 has branched.

BUG=315791

Review URL: https://codereview.chromium.org/60353005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233470 0039d316-1c4b-4281-b951-d872f2087c98