PNaCl doc: Remove TODOs from FAQ, update perf numbers

R= eliben@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3634
NOTRY=true
(documentation change)

Review URL: https://codereview.chromium.org/51783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231847 0039d316-1c4b-4281-b951-d872f2087c98
Update libvpx 228256:231684

Cherry pick security and bistream fixes for m31:
https://codereview.chromium.org/51483003/

Review URL: https://codereview.chromium.org/51893002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231848 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231849 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231848
SVN changes up to revision 231849