ExtensionFunction: don't pass ownership of base::Value by raw pointer.

extensions/browser/api/idle/idle_manager.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 EXTENSIONS_BROWSER_API_IDLE_IDLE_MANAGER_H_
 #define EXTENSIONS_BROWSER_API_IDLE_IDLE_MANAGER_H_
 
 #include <map>
+#include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/scoped_observer.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "components/keyed_service/core/keyed_service.h"
@@ skipping 64 matching lines @@
   void OnExtensionUnloaded(content::BrowserContext* browser_context,
                            const Extension* extension,
                            UnloadedExtensionInfo::Reason reason) override;
 
   // EventRouter::Observer implementation.
   void OnListenerAdded(const EventListenerInfo& details) override;
   void OnListenerRemoved(const EventListenerInfo& details) override;
 
   void QueryState(int threshold, QueryStateCallback notify);
   void SetThreshold(const std::string& extension_id, int threshold);
-  static base::StringValue* CreateIdleValue(ui::IdleState idle_state);
+  static std::unique_ptr<base::StringValue> CreateIdleValue(
+      ui::IdleState idle_state);
 
   // Override default event class. Callee assumes ownership. Used for testing.
   void SetEventDelegateForTest(std::unique_ptr<EventDelegate> event_delegate);
 
   // Override default idle time calculations. Callee assumes ownership. Used
   // for testing.
   void SetIdleTimeProviderForTest(
       std::unique_ptr<IdleTimeProvider> idle_provider);
 
  private:
@@ skipping 36 matching lines @@
       extension_registry_observer_;
 
   base::WeakPtrFactory<IdleManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IdleManager);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_IDLE_IDLE_MANAGER_H_