bump libyuv version to r528

BUG=168975
TEST=none
Review URL: https://codereview.chromium.org/11823018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175745 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -289,7 +289,7 @@ deps = {
         "/trunk/jsoncpp/src/lib_json@" + Var("jsoncpp_revision"),
 
   "src/third_party/libyuv":
-    (Var("googlecode_url") % "libyuv") + "/trunk@520",
+    (Var("googlecode_url") % "libyuv") + "/trunk@528",
 
   "src/third_party/smhasher/src":
     (Var("googlecode_url") % "smhasher") + "/trunk@147",