Switch SurfaceId maps from base::hash_map to std::unordered_map.

cc/surfaces/surface_factory.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 CC_SURFACES_SURFACE_FACTORY_H_
 #define CC_SURFACES_SURFACE_FACTORY_H_
 
 #include <set>
+#include <unordered_map>
 
 #include "base/callback_forward.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_resource_holder.h"
@@ skipping 59 matching lines @@
   bool needs_sync_points() const { return needs_sync_points_; }
   void set_needs_sync_points(bool needs) { needs_sync_points_ = needs; }
 
  private:
   SurfaceManager* manager_;
   SurfaceFactoryClient* client_;
   SurfaceResourceHolder holder_;
 
   bool needs_sync_points_;
 
-  typedef base::ScopedPtrHashMap<SurfaceId, scoped_ptr<Surface>>
+  typedef std::unordered_map<SurfaceId, scoped_ptr<Surface>, SurfaceIdHash>

[danakj, 2016/01/26 23:53:32]

can you switch this to "using" instead of "typedef" while you're touching it?

[lfg, 2016/01/27 00:53:14]

Done.

       OwningSurfaceMap;
   OwningSurfaceMap surface_map_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactory);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_FACTORY_H_