Update V8 DEPS.

DEPS

 # Note: The buildbots evaluate this file with CWD set to the parent
 # directory and assume that the root of the checkout is in ./v8/, so
 # all paths in here must match this assumption.
 
 vars = {
   "git_url": "https://chromium.googlesource.com",
 }
 
 deps = {
   "v8/build/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "01528c7244837168a1c80f06ff60fa5a9793c824",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "423fc7e1107fb08ccf007c4aeb76dcab8b2747c1",
   "v8/buildtools":
-    Var("git_url") + "/chromium/buildtools.git" + "@" + "e7111440c07a883b82ffbbe6d26c744dfc6c9673",
+    Var("git_url") + "/chromium/buildtools.git" + "@" + "0c88009d5c50b9f21b6f8849db08abfb9eb29f1e",
   "v8/tools/swarming_client":
     Var('git_url') + '/external/swarming.client.git' + '@' + "6e5d2b21f0ac98396cd736097a985346feed1328",
   "v8/testing/gtest":
     Var("git_url") + "/external/googletest.git" + "@" + "9855a87157778d39b95eccfb201a9dc90f6d61c6",
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "0421b6f358139f02e102c9c332ce19a33faf75be",
   "v8/tools/clang":
     Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "0150e39a3112dbc7e4c7a3ab25276b8d7781f3b6",
 }
 
@@ skipping 91 matching lines @@
     'name': 'clang',
     'pattern': '.',
     'action': ['python', 'v8/tools/clang/scripts/update.py', '--if-needed'],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "v8/build/gyp_v8"],
   },
 ]