Align base::hash_map with C++11.

base/memory/discardable_memory_manager.h

 // Copyright 2014 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 BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_
 #define BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_
 
 #include "base/base_export.h"
 #include "base/containers/hash_tables.h"
 #include "base/containers/mru_cache.h"
@@ skipping 20 matching lines @@
   // is acquired on the allocation.
   virtual void Purge() = 0;
 
  protected:
   virtual ~DiscardableMemoryManagerAllocation() {}
 };
 
 }  // namespace internal
 }  // namespace base
 
-#if defined(COMPILER_GCC)
-namespace BASE_HASH_NAMESPACE {
-template <>
-struct hash<base::internal::DiscardableMemoryManagerAllocation*> {
-  size_t operator()(
-      base::internal::DiscardableMemoryManagerAllocation* ptr) const {
-    return hash<size_t>()(reinterpret_cast<size_t>(ptr));
-  }
-};
-}  // namespace BASE_HASH_NAMESPACE
-#endif  // COMPILER
-
 namespace base {
 namespace internal {
 
 // The DiscardableMemoryManager manages a collection of
 // DiscardableMemoryManagerAllocation instances. It is used on platforms that
 // need some level of userspace control over discardable memory. It keeps track
 // of all allocation instances (in case they need to be purged), and the total
 // amount of allocated memory (in case this forces a purge). When memory usage
 // reaches the limit, the manager purges the LRU memory.
 class BASE_EXPORT_PRIVATE DiscardableMemoryManager {
@@ skipping 106 matching lines @@
   // |soft_memory_limit_|.
   TimeDelta hard_memory_limit_expiration_time_;
 
   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryManager);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_MEMORY_DISCARDABLE_MEMORY_MANAGER_H_