Align base::hash_map with C++11.

cc/trees/layer_sorter.h

 // Copyright 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.
 
 #ifndef CC_TREES_LAYER_SORTER_H_
 #define CC_TREES_LAYER_SORTER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer_impl.h"
 #include "ui/gfx/point3_f.h"
 #include "ui/gfx/quad_f.h"
 #include "ui/gfx/rect_f.h"
 #include "ui/gfx/vector3d_f.h"
 
-#if defined(COMPILER_GCC)
-namespace cc { struct GraphEdge; }
-
-namespace BASE_HASH_NAMESPACE {
-template <>
-struct hash<cc::GraphEdge*> {
-  size_t operator()(cc::GraphEdge* ptr) const {
-    return hash<size_t>()(reinterpret_cast<size_t>(ptr));
-  }
-};
-}  // namespace BASE_HASH_NAMESPACE
-#endif  // COMPILER
-
 namespace gfx {
 class Transform;
 }
 
 namespace cc {
 struct GraphEdge;
 
 // Holds various useful properties derived from a layer's 3D outline.
 struct CC_EXPORT LayerShape {
   LayerShape();
@@ skipping 63 matching lines @@
   void CreateGraphNodes(LayerImplList::iterator first,
                         LayerImplList::iterator last);
   void CreateGraphEdges();
   void RemoveEdgeFromList(GraphEdge* graph, std::vector<GraphEdge*>* list);
 
   DISALLOW_COPY_AND_ASSIGN(LayerSorter);
 };
 
 }  // namespace cc
 #endif  // CC_TREES_LAYER_SORTER_H_