Update V8 to verstion 3.5.9.1

Review URL: http://codereview.chromium.org/7791003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98782 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -30,7 +30,7 @@ vars = {
   "ffmpeg_revision": "98577",
   "sfntly_revision": "54",
   "skia_revision": "2183",
-  "v8_revision": "9008",
+  "v8_revision": "9061",
   "webrtc_revision": "242",
 
   # Note: On most bots, clang is not checked out via DEPS but by