Roll third_party/webpagereplay from r520 to r521.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/23653029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222087 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -233,7 +233,7 @@ deps = {
     "/trunk/tools/deps2git@214390",
 
   "src/third_party/webpagereplay":
-    (Var("googlecode_url") % "web-page-replay") + "/trunk@520",
+    (Var("googlecode_url") % "web-page-replay") + "/trunk@521",
 
   "src/third_party/pywebsocket/src":
     (Var("googlecode_url") % "pywebsocket") + "/trunk/src@662",