Remove a bunch of DeepCopy() calls in the chrome.storage API.

chrome/browser/extensions/api/storage/sync_storage_backend.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_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
 #define CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 49 matching lines @@
   syncer::SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const syncer::SyncChangeList& change_list) override;
   void StopSyncing(syncer::ModelType type) override;
 
  private:
   // Gets a weak reference to the storage area for a given extension,
   // initializing sync with some initial data if sync enabled.
   SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
       const std::string& extension_id,
-      const base::DictionaryValue& sync_data) const;
+      scoped_ptr<base::DictionaryValue> sync_data) const;
 
   // Gets all extension IDs known to extension settings.  This may not be all
   // installed extensions.
   std::set<std::string> GetKnownExtensionIDs() const;
 
   // Creates a new SettingsSyncProcessor for an extension.
   scoped_ptr<SettingsSyncProcessor> CreateSettingsSyncProcessor(
       const std::string& extension_id) const;
 
   // The Factory to use for creating new ValueStores.
@@ skipping 24 matching lines @@
   scoped_ptr<syncer::SyncErrorFactory> sync_error_factory_;
 
   syncer::SyncableService::StartSyncFlare flare_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncStorageBackend);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_STORAGE_SYNC_STORAGE_BACKEND_H_