Update V8 to version 3.8.0.

DEPS

 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "102542",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
@@ skipping 22 matching lines @@
   "libjingle_revision": "99",
   "libphonenumber_revision": "407",
   "libvpx_revision": "109236",
   "lss_revision": "9",
   "ffmpeg_revision": "112050",
   "sfntly_revision": "117",
   "skia_revision": "2850",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
-  "v8_revision": "10163",
+  "v8_revision": "10239",
   "webrtc_revision": "1165",
   "jsoncpp_revision": "246",
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@891",
 
   "src/build/util/support":
     "/trunk/deps/support@20411",
@@ skipping 45 matching lines @@
   "src/third_party/snappy/src":
     (Var("googlecode_url") % "snappy") + "/trunk@37",
 
   "src/tools/grit":
     (Var("googlecode_url") % "grit-i18n") + "/trunk@9",
 
   "src/tools/gyp":
     (Var("googlecode_url") % "gyp") + "/trunk@1104",
 
   "src/v8":
-    (Var("googlecode_url") % "v8") + "/branches/3.7@" + Var("v8_revision"),
+    (Var("googlecode_url") % "v8") + "/trunk@" + Var("v8_revision"),
 
   "src/native_client":
     Var("nacl_trunk") + "/src/native_client@" + Var("nacl_revision"),
 
   "src/native_client_sdk/src/site_scons":
     Var("nacl_trunk") + "/src/native_client/site_scons@" + Var("nacl_revision"),
 
   "src/third_party/pymox/src":
     (Var("googlecode_url") % "pymox") + "/trunk@70",
 
@@ skipping 360 matching lines @@
     # which takes ~20s, but clang speeds up builds by more than 20s.
     "pattern": ".",
     "action": ["python", "src/tools/clang/scripts/update.py", "--mac-only"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]