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

cc/surfaces/surface_manager.h

Index: cc/surfaces/surface_manager.h
diff --git a/cc/surfaces/surface_manager.h b/cc/surfaces/surface_manager.h
index 7466501545b022a27074c8cc0414a2f3295a5e22..6c10e38bd158a41920113f08f5c279cfefc8efd8 100644
--- a/cc/surfaces/surface_manager.h
+++ b/cc/surfaces/surface_manager.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include <list>
+#include <unordered_map>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ -60,7 +61,7 @@ class CC_SURFACES_EXPORT SurfaceManager {
  private:
   void GarbageCollectSurfaces();
 
-  typedef base::hash_map<SurfaceId, Surface*> SurfaceMap;
+  typedef std::unordered_map<SurfaceId, Surface*, SurfaceIdHash> SurfaceMap;

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

can use using here too?

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

Done.

   SurfaceMap surface_map_;
   base::ObserverList<SurfaceDamageObserver> observer_list_;
   base::ThreadChecker thread_checker_;