Revert of Update V8 to version 3.28.30 (based on bleeding_edge revision...

Revert of Update V8 to version 3.28.30 (based on bleeding_edge revision r22489). (https://codereview.chromium.org/407733005/)

Reason for revert:
Seems to be causing xss-DENIED-method-with-iframe-proto.html to time out on multiple bots; see http://crbug.com/395882 .

Original issue's description:
> Update V8 to version 3.28.30 (based on bleeding_edge revision r22489).
> 
> Please reply to the V8 sheriff svenpanne@chromium.org in case of problems.
> 
> TBR=svenpanne@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284420

TBR=svenpanne@chromium.org,machenbach@chromium.org
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/405313002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284572 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -51,7 +51,7 @@ vars = {
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   "v8_branch": "trunk",
-  "v8_revision": "22491",
+  "v8_revision": "22479",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.