Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/api/downloads/downloads_api.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_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_
 
 #include <set>
 #include <string>
 
@@ skipping 277 matching lines @@
   DownloadsGetFileIconFunction();
   bool RunAsync() override;
   void SetIconExtractorForTesting(DownloadFileIconExtractor* extractor);
 
  protected:
   ~DownloadsGetFileIconFunction() override;
 
  private:
   void OnIconURLExtracted(const std::string& url);
   base::FilePath path_;
-  scoped_ptr<DownloadFileIconExtractor> icon_extractor_;
+  std::unique_ptr<DownloadFileIconExtractor> icon_extractor_;
   DISALLOW_COPY_AND_ASSIGN(DownloadsGetFileIconFunction);
 };
 
 // Observes a single DownloadManager and many DownloadItems and dispatches
 // onCreated and onErased events.
 class ExtensionDownloadsEventRouter
     : public extensions::EventRouter::Observer,
       public extensions::ExtensionRegistryObserver,
       public AllDownloadItemNotifier::Observer {
  public:
@@ skipping 97 matching lines @@
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDownloadsEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DOWNLOADS_DOWNLOADS_API_H_