Revert 107694 and 107687 "Update V8 to version 3.7.3." and "Update V8 to version 3.7.2."

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": "98752",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
@@ skipping 13 matching lines @@
       "7730f4515c745c0c012df4a1080be9a46ffcda47",
   "nacl_toolchain_linux_x86_newlib_hash":
       "596aa5b812ec4b24160ed7ce55b3fd141f929fbf",
   "nacl_toolchain_revision": "6757",
 
   "libjingle_revision": "88",
   "libvpx_revision": "107145",
   "ffmpeg_revision": "107500",
   "sfntly_revision": "98",
   "skia_revision": "2549",
-  "v8_revision": "9825",
+  "v8_revision": "9637",
   "webrtc_revision": "808",
   "jsoncpp_revision": "246",
 
   # Note: On most bots, clang is not checked out via DEPS but by
   # tools/clang/scripts/update.sh. The script reads this line here.
   # Do NOT CHANGE this if you don't know what you're doing -- see
   # http://code.google.com/p/chromium/wiki/UpdatingClang
   "clang_revision": "142926",
 }
 
@@ skipping 51 matching lines @@
   "src/third_party/snappy/src":
     (Var("googlecode_url") % "snappy") + "/trunk@37",
 
   "src/tools/grit":
     (Var("googlecode_url") % "grit-i18n") + "/trunk@6",
 
   "src/tools/gyp":
     (Var("googlecode_url") % "gyp") + "/trunk@1083",
 
   "src/v8":
-    (Var("googlecode_url") % "v8") + "/trunk@" + Var("v8_revision"),
+    (Var("googlecode_url") % "v8") + "/branches/3.6@" + Var("v8_revision"),
 
   "src/native_client":
     Var("nacl_trunk") + "/src/native_client@" + Var("nacl_revision"),
 
   "src/chrome/test/data/extensions/api_test/permissions/nacl_enabled/bin":
     Var("nacl_trunk") + "/src/native_client/tests/prebuilt@" +
     Var("nacl_revision"),
 
   "src/third_party/sfntly/src/sfntly":
     (Var("googlecode_url") % "sfntly") + "/trunk/cpp/src/sfntly@" +
@@ skipping 329 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"],
   },
 ]