Remove duplicate CPU detection code; use base::CPU instead.

media/base/cpu_features_arm.cc

Index: media/base/cpu_features_arm.cc
diff --git a/media/base/cpu_features_arm.cc b/media/base/cpu_features_arm.cc
deleted file mode 100644
index a0d5c680aaeb9838e48bec4432be05f2778aea42..0000000000000000000000000000000000000000
--- a/media/base/cpu_features_arm.cc
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "media/base/cpu_features.h"
-
-namespace media {
-
-bool hasSSE2() {
-  return false;
-}
-
-bool hasSSSE3() {
-  return false;
-}
-
-}  // namespace media