Switch cc to std::unordered_*.

cc/trees/layer_tree_impl.h

 // Copyright 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 CC_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
-#include "base/containers/hash_tables.h"
 #include "base/macros.h"
 #include "base/values.h"
 #include "cc/base/synced_property.h"
 #include "cc/input/layer_selection_bound.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/output/renderer.h"
 #include "cc/output/swap_promise.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/trees/layer_tree_host_impl.h"
@@ skipping 451 matching lines @@
 
   scoped_refptr<SyncedProperty<ScaleGroup>> page_scale_factor_;
   float min_page_scale_factor_;
   float max_page_scale_factor_;
 
   float device_scale_factor_;
   float painted_device_scale_factor_;
 
   scoped_refptr<SyncedElasticOverscroll> elastic_overscroll_;
 
-  typedef base::hash_map<int, LayerImpl*> LayerIdMap;
+  using LayerIdMap = std::unordered_map<int, LayerImpl*>;
   LayerIdMap layer_id_map_;
 
-  base::hash_map<uint64_t, ElementLayers> element_layers_map_;
+  std::unordered_map<uint64_t, ElementLayers> element_layers_map_;
 
   // Maps from clip layer ids to scroll layer ids.  Note that this only includes
   // the subset of clip layers that act as scrolling containers.  (This is
   // derived from LayerImpl::scroll_clip_layer_ and exists to avoid O(n) walks.)
-  base::hash_map<int, int> clip_scroll_map_;
+  std::unordered_map<int, int> clip_scroll_map_;
 
   // Maps scroll layer ids to scrollbar layer ids.  For each scroll layer, there
   // may be 1 or 2 scrollbar layers (for vertical and horizontal).  (This is
   // derived from ScrollbarLayerImplBase::scroll_layer_id_ and exists to avoid
   // O(n) walks.)
   std::multimap<int, int> scrollbar_map_;
 
   std::vector<PictureLayerImpl*> picture_layers_;
   std::vector<LayerImpl*> layers_with_copy_output_request_;
   std::vector<LayerImpl*> surface_layers_;
@@ skipping 34 matching lines @@
 
   scoped_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_