Update V8 DEPS.

Rolling v8/third_party/icu to 423fc7e1107fb08ccf007c4aeb76dcab8b2747c1

Rolling v8/tools/clang to 290301c180118e27755bfced176ff61bd0acb1b8

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review URL: https://codereview.chromium.org/1373683002

Cr-Commit-Position: refs/heads/master@{#30951}

DEPS

@@ -10,7 +10,7 @@ deps = {
   "v8/build/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "01528c7244837168a1c80f06ff60fa5a9793c824",
   "v8/third_party/icu":
-    Var("git_url") + "/chromium/deps/icu.git" + "@" + "6b3ce817f8e828c3b7a577d2395f0882eb56ef18",
+    Var("git_url") + "/chromium/deps/icu.git" + "@" + "423fc7e1107fb08ccf007c4aeb76dcab8b2747c1",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "f7310ee61725e68b1c8921e381830362cf4f0999",
   "v8/tools/swarming_client":
@@ -20,7 +20,7 @@ deps = {
   "v8/testing/gmock":
     Var("git_url") + "/external/googlemock.git" + "@" + "0421b6f358139f02e102c9c332ce19a33faf75be",
   "v8/tools/clang":
-    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "1f65dc9f9e1879a25d79a8bc46a12265532e4a0f",
+    Var("git_url") + "/chromium/src/tools/clang.git" + "@" + "290301c180118e27755bfced176ff61bd0acb1b8",
 }
 
 deps_os = {