Switch base::Value typemapping to be by value instead of by unique_ptr.

chrome/utility/profile_import_handler.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_UTILITY_PROFILE_IMPORT_HANDLER_H_
 #define CHROME_UTILITY_PROFILE_IMPORT_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 22 matching lines @@
   ProfileImportHandler();
   ~ProfileImportHandler() override;
 
   static void Create(
       mojo::InterfaceRequest<chrome::mojom::ProfileImport> request);
 
  private:
   // chrome::mojom::ProfileImport:
   void StartImport(const importer::SourceProfile& source_profile,
                    uint16_t items,
-                   std::unique_ptr<base::DictionaryValue> localized_strings,
+                   const base::DictionaryValue& localized_strings,
                    chrome::mojom::ProfileImportObserverPtr observer) override;
   void CancelImport() override;
   void ReportImportItemFinished(importer::ImportItem item) override;
 
   // The following are used with out of process profile import:
   void ImporterCleanup();
 
   // Thread that importer runs on, while ProfileImportThread handles messages
   // from the browser process.
   std::unique_ptr<base::Thread> import_thread_;
 
   // Bridge object is passed to importer, so that it can send IPC calls
   // directly back to the ProfileImportProcessHost.
   scoped_refptr<ExternalProcessImporterBridge> bridge_;
 
   // A bitmask of importer::ImportItem.
   uint16_t items_to_import_;
 
   // Importer of the appropriate type (Firefox, Safari, IE, etc.)
   scoped_refptr<Importer> importer_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImportHandler);
 };
 
 #endif  // CHROME_UTILITY_PROFILE_IMPORT_HANDLER_H_