Update V8 to version 3.26.26 (based on bleeding_edge revision r21007).

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 33 matching lines @@
   "ffmpeg_hash": "ac4a9f31fe2610bd146857bbd55d7a260003a888",
 
   "sfntly_revision": "228",
   "lighttpd_revision": "33737",
   "skia_revision": "14349",
   "skia_hash": "94e2872d48b83e584b211ddc70bf6492aef93d7f",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   "v8_branch": "trunk",
-  "v8_revision": "20953",
+  "v8_revision": "21011",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.
   "webrtc_revision": "5963",
   "jsoncpp_revision": "248",
   "nss_revision": "265958",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
   "swarming_revision": "4eeada947e2fa4f48100ebb39b740bccabbc7747",
@@ skipping 691 matching lines @@
                 "-s", "src/build/linux/bin/eu-strip.sha1",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]