command_buffer: Remove hash_tables.h, simplify atomicops.h

gpu/command_buffer/client/hash_tables.h

Index: gpu/command_buffer/client/hash_tables.h
diff --git a/gpu/command_buffer/client/hash_tables.h b/gpu/command_buffer/client/hash_tables.h
deleted file mode 100644
index fff3098dea6ce54e8119f32ab65f691ca074cfdf..0000000000000000000000000000000000000000
--- a/gpu/command_buffer/client/hash_tables.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2012 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.
-
-#ifndef GPU_COMMAND_BUFFER_CLIENT_HASH_TABLES_H_
-#define GPU_COMMAND_BUFFER_CLIENT_HASH_TABLES_H_
-
-#if defined(__native_client__)
-#include <tr1/unordered_map>
-namespace gpu {
-template <typename key, typename value>
-struct hash_map : public std::tr1::unordered_map<key, value> {
-};
-}
-#else
-#include "base/containers/hash_tables.h"
-namespace gpu {
-template <typename key, typename value>
-struct hash_map : public base::hash_map<key, value> {
-};
-}
-#endif
-
-#endif  // GPU_COMMAND_BUFFER_CLIENT_HASH_TABLES_H_