Allow std::unordered_*.

cc/surfaces/surface_sequence.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_SEQUENCE_H_
 #define CC_SURFACES_SURFACE_SEQUENCE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <tuple>
 
 #include "base/containers/hash_tables.h"
+#include "base/hash.h"
 
 namespace cc {
 
 // A per-surface-namespace sequence number that's used to coordinate
 // dependencies between frames. A sequence number may be satisfied once, and
 // may be depended on once.
 struct SurfaceSequence {
   SurfaceSequence() : id_namespace(0u), sequence(0u) {}
   SurfaceSequence(uint32_t id_namespace, uint32_t sequence)
       : id_namespace(id_namespace), sequence(sequence) {}
@@ skipping 15 matching lines @@
   return std::tie(a.id_namespace, a.sequence) <
          std::tie(b.id_namespace, b.sequence);
 }
 
 }  // namespace cc
 
 namespace BASE_HASH_NAMESPACE {
 template <>
 struct hash<cc::SurfaceSequence> {
   size_t operator()(cc::SurfaceSequence key) const {
-    return base::HashPair(key.id_namespace, key.sequence);
+    return base::HashInts(key.id_namespace, key.sequence);
   }
 };
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // CC_SURFACES_SURFACE_SEQUENCE_H_