Update V8 DEPS.

Rolling v8/build/gyp to 79de4031069f37870f04e8b6bbf42f0c7fec37aa

Rolling v8/tools/clang to 66ba82eea5b4e2309c220cc3e0f2d67ebc3fff4c

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1187073008

Cr-Commit-Position: refs/heads/master@{#29035}

DEPS

@@ -8,7 +8,7 @@ vars = {
 
 deps = {
   "v8/build/gyp":
-    Var("git_url") + "/external/gyp.git" + "@" + "fdc7b812f99e48c00e9a487bd56751bbeae07043",
+    Var("git_url") + "/external/gyp.git" + "@" + "79de4031069f37870f04e8b6bbf42f0c7fec37aa",
   "v8/third_party/icu":
     Var("git_url") + "/chromium/deps/icu.git" + "@" + "a05f412f70489b77da0ddeb8baa31c68e3eff2c6",
   "v8/buildtools":
@@ -18,7 +18,7 @@ deps = {
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "29763965ab52f24565299976b936d1265cb6a271",  # from svn revision 501
   "v8/tools/clang":
-    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "bb23ac0328fd3d051fc2f5ff027c8e0f87cc6fb5",
+    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "66ba82eea5b4e2309c220cc3e0f2d67ebc3fff4c",
 }
 
 deps_os = {