Switch cc to 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/containers/pair_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) {}
   bool is_null() const { return id_namespace == 0u && sequence == 0u; }
 
   uint32_t id_namespace;
   uint32_t sequence;
 };
 
 inline bool operator==(const SurfaceSequence& a, const SurfaceSequence& b) {
   return a.id_namespace == b.id_namespace && a.sequence == b.sequence;
 }
 
 inline bool operator!=(const SurfaceSequence& a, const SurfaceSequence& b) {
   return !(a == b);
 }
 
 inline bool operator<(const SurfaceSequence& a, const SurfaceSequence& b) {
   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 {
+struct SurfaceSequenceHash {
+  size_t operator()(SurfaceSequence key) const {
     return base::HashPair(key.id_namespace, key.sequence);
   }
 };
-}  // namespace BASE_HASH_NAMESPACE
+
+}  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_SEQUENCE_H_