Update V8 DEPS.

Rolling v8/build to 298aeabfe2aa544f7be8cab05a133428bca7dea3

Rolling v8/third_party/icu to 54f86bb1d1d02968576d21c16d7134ec35c30fbc

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

Review-Url: https://codereview.chromium.org/2005633002
Cr-Commit-Position: refs/heads/master@{#36424}

DEPS

@@ -8,11 +8,11 @@ vars = {
 
 deps = {
   "v8/build":
-    Var("git_url") + "/chromium/src/build.git" + "@" + "f81cc400005454453b83aad6e47e321a37d092dd",
+    Var("git_url") + "/chromium/src/build.git" + "@" + "298aeabfe2aa544f7be8cab05a133428bca7dea3",
   "v8/tools/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "bce1c7793010574d88d7915e2d55395213ac63d1",
   "v8/third_party/icu":
-    Var("git_url") + "/chromium/deps/icu.git" + "@" + "d9f48be67ba790adbc59d3ab195b2d8278c9d73b",
+    Var("git_url") + "/chromium/deps/icu.git" + "@" + "54f86bb1d1d02968576d21c16d7134ec35c30fbc",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "06e80a0e17319868d4a9b13f9bb6a248dc8d8b20",
   "v8/base/trace_event/common":