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":
-    Var("git_url") + "/chromium/src/build.git" + "@" + "47d75963ee42a9b9688e4f85c097b3a15d4f2bb2",
+    Var("git_url") + "/chromium/src/build.git" + "@" + "5782f1c84fc41934d265f69e5bd61badbf61e5c5",
   "v8/tools/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "e7079f0e0e14108ab0dba58728ff219637458563",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "b5ecbb29a26532f72ef482569b223d5a51fd50bf",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "60f7f9a8b421ebf9a46041dfa2ff11c0fe59c582",
   "v8/base/trace_event/common":
     Var("git_url") + "/chromium/src/base/trace_event/common.git" + "@" + "315bf1e2d45be7d53346c31cfcc37424a32c30c8",
   "v8/tools/mb":
-    Var('git_url') + '/chromium/src/tools/mb.git' + '@' + "1815b6867db701b1bba1c223e4f67811196122ea",
+    Var('git_url') + '/chromium/src/tools/mb.git' + '@' + "c0f2da01e7e7e530fcbbf3823b7c7655632f05b1",
   "v8/tools/swarming_client":
     Var('git_url') + '/external/swarming.client.git' + '@' + "7f63a272f7d9785ce41b6d10bb3106c49a968e57",
   "v8/testing/gtest":
     Var("git_url") + "/external/github.com/google/googletest.git" + "@" + "6f8a66431cb592dad629028a50b3dd418a408c87",
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "0421b6f358139f02e102c9c332ce19a33faf75be",
   "v8/test/benchmarks/data":
     Var("git_url") + "/v8/deps/third_party/benchmarks.git" + "@" + "05d7188267b4560491ff9155c5ee13e207ecd65f",
   "v8/test/mozilla/data":
     Var("git_url") + "/v8/deps/third_party/mozilla-tests.git" + "@" + "f6c578a10ea707b1a8ab0b88943fe5115ce2b9be",
@@ skipping 203 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/gypfiles/gyp_v8"],
   },
 ]