Rollback to Version 3.28.4 (based on bleeding_edge revision r22031)

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index eb164c4c2dd487f29170205cb486346d70bf109a..df419a78a370210c17e1e9f0615d3e92fcb18f55 100644
--- a/DEPS
+++ b/DEPS
@@ -5,7 +5,7 @@
 vars = {
   "chromium_trunk": "https://src.chromium.org/svn/trunk",
 
-  "buildtools_revision": "fb782d4369d5ae04f17a2fceef7de5a63e50f07b",
+  "buildtools_revision": "5d89977ce55240995d1596fe420b818468f5ec37",
 }
 
 deps = {
@@ -44,40 +44,6 @@ skip_child_includes = [
 ]
 
 hooks = [
-  # Pull clang-format binaries using checked-in hashes.
-  {
-    "name": "clang_format_win",
-    "pattern": ".",
-    "action": [ "download_from_google_storage",
-                "--no_resume",
-                "--platform=win32",
-                "--no_auth",
-                "--bucket", "chromium-clang-format",
-                "-s", "v8/buildtools/win/clang-format.exe.sha1",
-    ],
-  },
-  {
-    "name": "clang_format_mac",
-    "pattern": ".",
-    "action": [ "download_from_google_storage",
-                "--no_resume",
-                "--platform=darwin",
-                "--no_auth",
-                "--bucket", "chromium-clang-format",
-                "-s", "v8/buildtools/mac/clang-format.sha1",
-    ],
-  },
-  {
-    "name": "clang_format_linux",
-    "pattern": ".",
-    "action": [ "download_from_google_storage",
-                "--no_resume",
-                "--platform=linux*",
-                "--no_auth",
-                "--bucket", "chromium-clang-format",
-                "-s", "v8/buildtools/linux64/clang-format.sha1",
-    ],
-  },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",