Update v8 to version 2.2.1.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2868040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@51246 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -52,7 +52,7 @@ deps = {
     "http://gyp.googlecode.com/svn/trunk@826",
 
   "src/v8":
-    "http://v8.googlecode.com/svn/trunk@4962",
+    "http://v8.googlecode.com/svn/trunk@4988",
 
   "src/native_client":
     "http://nativeclient.googlecode.com/svn/trunk/src/native_client@" +