Update V8 to version 3.26.5 (based on bleeding_edge revision r20452).

[re-land of 261450]

> Revert 261450 "Update V8 to version 3.26.5 (based on bleeding_ed..."
> 
> Failing on all bots (http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/10031)
> 
> 
> 
> > Update V8 to version 3.26.5 (based on bleeding_edge revision r20452).
> > 
> > TBR=jochen@chromium.org
> > NOTRY=true
> > 
> > Review URL: https://codereview.chromium.org/223403002
> 
> TBR=machenbach@chromium.org
> 
> Review URL: https://codereview.chromium.org/222583004

TBR=mallinath@chromium.org,jochen@chromium.org,machenbach@chromium.org

Review URL: https://codereview.chromium.org/224283003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261523 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": "20418",
+  "v8_revision": "20459",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.