Remove uses of base::hash_map from //chrome

chrome/browser/android/thumbnail/thumbnail_cache.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_ANDROID_THUMBNAIL_THUMBNAIL_CACHE_H_
 #define CHROME_BROWSER_ANDROID_THUMBNAIL_THUMBNAIL_CACHE_H_
 
 #include <stddef.h>
 
 #include <list>
+#include <map>
 #include <set>
 #include <string>
 
 #include "base/bind.h"
-#include "base/containers/hash_tables.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "base/time/time.h"
 #include "chrome/browser/android/thumbnail/scoped_ptr_expiring_cache.h"
 #include "chrome/browser/android/thumbnail/thumbnail.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
@@ skipping 57 matching lines @@
     ThumbnailMetaData();
     ThumbnailMetaData(const base::Time& current_time, const GURL& url);
     const GURL& url() const { return url_; }
     base::Time capture_time() const { return capture_time_; }
 
    private:
     base::Time capture_time_;
     GURL url_;
   };
 
-  typedef ScopedPtrExpiringCache<TabId, Thumbnail> ExpiringThumbnailCache;
-  typedef base::hash_map<TabId, ThumbnailMetaData> ThumbnailMetaDataMap;
+  using ExpiringThumbnailCache = ScopedPtrExpiringCache<TabId, Thumbnail>;
+  using ThumbnailMetaDataMap = std::map<TabId, ThumbnailMetaData>;
 
   void RemoveFromDisk(TabId tab_id);
   static void RemoveFromDiskTask(TabId tab_id);
   void WriteThumbnailIfNecessary(TabId tab_id,
                                  sk_sp<SkPixelRef> compressed_data,
                                  float scale,
                                  const gfx::Size& content_size);
   void CompressThumbnailIfNecessary(TabId tab_id,
                                     const base::Time& time_stamp,
                                     const SkBitmap& bitmap,
@@ skipping 59 matching lines @@
 
   ui::UIResourceProvider* ui_resource_provider_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_;
   base::WeakPtrFactory<ThumbnailCache> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailCache);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_THUMBNAIL_THUMBNAIL_CACHE_H_