Update libvpx revision in DEPS
Update libvpx revision in DEPS

This brings in these changes:

http://codereview.chromium.org/8501011 r109236 Suppress libvpx warning
http://codereview.chromium.org/8666017 r113567 Build libvpx on non-Mac POSIX platforms also, by reusing the linux config.
http://codereview.chromium.org/9185015 r117274 Compile libvpx code as PIC for all Linux targets

BUG= http://code.google.com/p/chromium/issues/detail?id=109318
TEST= sizes test should show chrome-textrel=0

R=jkoleszar@google.com

Review URL: http://codereview.chromium.org/9187016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@117287 0039d316-1c4b-4281-b951-d872f2087c98

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