Remove base::ScopedPtrHashMap from chrome/browser/sync_file_system/drive_backend/

chrome/browser/sync_file_system/drive_backend/metadata_database_index.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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_INDEX_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_INDEX_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <set>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/hash.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/sync_file_system/drive_backend/metadata_database_index_interface.h"
 #include "chrome/browser/sync_file_system/drive_backend/tracker_id_set.h"
 
@@ skipping 73 matching lines @@
   void SetNextTrackerID(int64_t next_tracker_id) const override;
   bool IsSyncRootRevalidated() const override;
   int64_t GetSyncRootTrackerID() const override;
   int64_t GetLargestChangeID() const override;
   int64_t GetNextTrackerID() const override;
   std::vector<std::string> GetRegisteredAppIDs() const override;
   std::vector<int64_t> GetAllTrackerIDs() const override;
   std::vector<std::string> GetAllMetadataIDs() const override;
 
  private:
-  typedef base::ScopedPtrHashMap<std::string, std::unique_ptr<FileMetadata>>
+  typedef std::unordered_map<std::string, std::unique_ptr<FileMetadata>>
       MetadataByID;
-  typedef base::ScopedPtrHashMap<int64_t, std::unique_ptr<FileTracker>>
-      TrackerByID;
+  typedef std::unordered_map<int64_t, std::unique_ptr<FileTracker>> TrackerByID;
   typedef base::hash_map<std::string, TrackerIDSet> TrackerIDsByFileID;
   typedef base::hash_map<std::string, TrackerIDSet> TrackerIDsByTitle;
   typedef std::map<int64_t, TrackerIDsByTitle> TrackerIDsByParentAndTitle;
   typedef base::hash_map<std::string, int64_t> TrackerIDByAppID;
   typedef base::hash_set<std::string> FileIDSet;
   typedef base::hash_set<ParentIDAndTitle> PathSet;
   typedef std::set<int64_t> DirtyTrackers;
 
   friend class MetadataDatabaseTest;
 
@@ skipping 42 matching lines @@
   DirtyTrackers dirty_trackers_;
   DirtyTrackers demoted_dirty_trackers_;
 
   DISALLOW_COPY_AND_ASSIGN(MetadataDatabaseIndex);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_INDEX_H_