Remove uses of base::hash_map from //chrome

chrome/browser/media_galleries/fileapi/media_path_filter.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 CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_PATH_FILTER_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_PATH_FILTER_H_
 
 #include <stddef.h>
 
+#include <map>
 #include <string>
 #include <vector>
 
-#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/sequence_checker.h"
 
 enum MediaGalleryFileType {
   MEDIA_GALLERY_FILE_TYPE_UNKNOWN = 0,
   MEDIA_GALLERY_FILE_TYPE_AUDIO = 1 << 0,
   MEDIA_GALLERY_FILE_TYPE_IMAGE = 1 << 1,
   MEDIA_GALLERY_FILE_TYPE_VIDEO = 1 << 2,
 };
@@ skipping 14 matching lines @@
 
   // Returns the type of |path| or MEDIA_GALLERY_FILE_TYPE_UNKNOWN if it
   // is not a media file.
   MediaGalleryFileType GetType(const base::FilePath& path);
 
  private:
   typedef std::vector<base::FilePath::StringType> MediaFileExtensionList;
 
   // Key: .extension
   // Value: MediaGalleryFileType, but stored as an int to allow "|="
-  typedef base::hash_map<base::FilePath::StringType, int> MediaFileExtensionMap;
+  using MediaFileExtensionMap = std::map<base::FilePath::StringType, int>;
 
   void EnsureInitialized();
 
   void AddExtensionsToMediaFileExtensionMap(
       const MediaFileExtensionList& extensions_list,
       MediaGalleryFileType type);
   void AddAdditionalExtensionsToMediaFileExtensionMap(
       const base::FilePath::CharType* const* extensions_list,
       size_t extensions_list_size,
       MediaGalleryFileType type);
   void AddExtensionToMediaFileExtensionMap(
       const base::FilePath::CharType* extension,
       MediaGalleryFileType type);
 
   // Checks |initialized_| is only accessed on one sequence.
   base::SequenceChecker sequence_checker_;
   bool initialized_;
   MediaFileExtensionMap media_file_extensions_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPathFilter);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_PATH_FILTER_H_