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 = {
   "chromium_url": "https://chromium.googlesource.com",
 }
 
 deps = {
   "v8/build":
-    Var("chromium_url") + "/chromium/src/build.git" + "@" + "87bb8bc8acec1eebdd3ef34057508739897a12cc",
+    Var("chromium_url") + "/chromium/src/build.git" + "@" + "7ec7ad1a5dba8b996440e3bcbd05983cbd41ef3b",
   "v8/tools/gyp":
     Var("chromium_url") + "/external/gyp.git" + "@" + "702ac58e477214c635d9b541932e75a95d349352",
   "v8/third_party/icu":
     Var("chromium_url") + "/chromium/deps/icu.git" + "@" + "b0bd3ee50bc2e768d7a17cbc60d87f517f024dbe",
   "v8/third_party/instrumented_libraries":
     Var("chromium_url") + "/chromium/src/third_party/instrumented_libraries.git" + "@" + "45f5814b1543e41ea0be54c771e3840ea52cca4a",
   "v8/buildtools":
-    Var("chromium_url") + "/chromium/buildtools.git" + "@" + "57649e5e2001ba1f5e5d45f5a838c616ea0e9cb9",
+    Var("chromium_url") + "/chromium/buildtools.git" + "@" + "86f7e41d9424b9d8faf66c601b129855217f9a08",
   "v8/base/trace_event/common":
     Var("chromium_url") + "/chromium/src/base/trace_event/common.git" + "@" + "6232c13e4edb36c84c61653fdae5a4afb5af9745",
   "v8/third_party/WebKit/Source/platform/inspector_protocol":
     Var("chromium_url") + "/chromium/src/third_party/WebKit/Source/platform/inspector_protocol.git" + "@" + "e240fdcdb5880deb48156dbb9ccee0c28664cf88",
   "v8/third_party/jinja2":
     Var("chromium_url") + "/chromium/src/third_party/jinja2.git" + "@" + "b61a2c009a579593a259c1b300e0ad02bf48fd78",
   "v8/third_party/markupsafe":
     Var("chromium_url") + "/chromium/src/third_party/markupsafe.git" + "@" + "484a5661041cac13bfc688a26ec5434b05d18961",
   "v8/tools/swarming_client":
     Var('chromium_url') + '/external/swarming.client.git' + '@' + "380e32662312eb107f06fcba6409b0409f8fef72",
@@ skipping 256 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", "--running-as-hook"],
   },
 ]