Revert of Convert //net and //chromecast to std::unordered_*

net/disk_cache/memory/mem_entry_impl.h

 // Copyright (c) 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 NET_DISK_CACHE_MEMORY_MEM_ENTRY_IMPL_H_
 #define NET_DISK_CACHE_MEMORY_MEM_ENTRY_IMPL_H_
 
 #include <stdint.h>
 
 #include <string>
-#include <unordered_map>
 #include <vector>
 
+#include "base/containers/hash_tables.h"
 #include "base/containers/linked_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/log/net_log.h"
 
 namespace disk_cache {
 
@@ skipping 102 matching lines @@
   void CancelSparseIO() override {}
   int ReadyForSparseIO(const CompletionCallback& callback) override;
 
  private:
   MemEntryImpl(MemBackendImpl* backend,
                const std::string& key,
                int child_id,
                MemEntryImpl* parent,
                net::NetLog* net_log);
 
-  using EntryMap = std::unordered_map<int, MemEntryImpl*>;
+  typedef base::hash_map<int, MemEntryImpl*> EntryMap;
 
   static const int kNumStreams = 3;
 
   ~MemEntryImpl() override;
 
   // Do all the work for corresponding public functions.  Implemented as
   // separate functions to make logging of results simpler.
   int InternalReadData(int index, int offset, IOBuffer* buf, int buf_len);
   int InternalWriteData(int index, int offset, IOBuffer* buf, int buf_len,
                         bool truncate);
@@ skipping 33 matching lines @@
   bool doomed_;               // True if this entry was removed from the cache.
 
   net::BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(MemEntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_MEMORY_MEM_ENTRY_IMPL_H_