Switch cc to std::unordered_*.

cc/layers/layer_proto_converter.h

 // Copyright 2015 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_LAYERS_LAYER_PROTO_CONVERTER_H_
 #define CC_LAYERS_LAYER_PROTO_CONVERTER_H_
 
+#include <unordered_map>
+
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
 
 namespace cc {
 
 namespace proto {
 class LayerNode;
 class LayerUpdate;
 }
@@ skipping 37 matching lines @@
  private:
   LayerProtoConverter();
   ~LayerProtoConverter();
 
   // This method is the inner recursive function for SerializeLayerProperties
   // declared above.
   static void RecursivelySerializeLayerProperties(
       Layer* root_layer,
       proto::LayerUpdate* layer_update);
 
-  using LayerIdMap = base::hash_map<int, scoped_refptr<Layer>>;
+  using LayerIdMap = std::unordered_map<int, scoped_refptr<Layer>>;
   // Start at |layer| and recursively add |layer| and all its children and
   // special layers to |layer_id_map|.
   static void RecursivelyFindAllLayers(const scoped_refptr<Layer>& layer,
                                        LayerIdMap* layer_id_map);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_PROTO_CONVERTER_H_