Update V8 to version 3.30.28 (based on 8c5fdd0575079324a9a2a5a905075db23cc6177b).

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/699563002

Cr-Commit-Position: refs/heads/master@{#302421}

DEPS

@@ -49,7 +49,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   'v8_branch': 'trunk',
-  'v8_revision': '78b694ed1084696cb7b8c01ec78e79ff24e255e8', # from svn revision 25034
+  'v8_revision': '8955e55db30b31cae138a39218f4086c7774c32a', # from svn revision 25059
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.