Roll libyuv 9107460..5a09c3e (1125:1130)

This unblocks rolling WebRTC, since it depends on
libyuv and cannot use the dependency to ppapi, which
was removed in https://code.google.com/p/libyuv/source/detail?r=1130.

BUG=libyuv:374

Review URL: https://codereview.chromium.org/666103002

Cr-Commit-Position: refs/heads/master@{#300483}

DEPS

@@ -256,7 +256,7 @@ deps = {
     Var('chromium_git') + '/external/jsoncpp/jsoncpp/src/lib_json.git' + '@' + 'a8caa51ba2f80971a45880425bf2ae864a786784',
 
   'src/third_party/libyuv':
-    Var('chromium_git') + '/external/libyuv.git' + '@' + '9107460c7f76a10cc4122d91e62b0580eacd376e',
+    Var('chromium_git') + '/external/libyuv.git' + '@' + '5a09c3ef2aa3e6b6da4007746fdde04ca56dae7c', # from svn revision 1130
 
   'src/third_party/smhasher/src':
     Var('chromium_git') + '/external/smhasher.git' + '@' + 'e87738e57558e0ec472b2fc3a643b838e5b6e88f',