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

extensions/browser/mock_extension_system.cc

 // 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.
 
 #include "extensions/browser/mock_extension_system.h"
 
 #include "extensions/browser/value_store/value_store_factory.h"
 #include "extensions/common/extension_set.h"
 
 namespace extensions {
@@ skipping 53 matching lines @@
 }
 
 const OneShotEvent& MockExtensionSystem::ready() const {
   return ready_;
 }
 
 ContentVerifier* MockExtensionSystem::content_verifier() {
   return nullptr;
 }
 
-scoped_ptr<ExtensionSet> MockExtensionSystem::GetDependentExtensions(
+std::unique_ptr<ExtensionSet> MockExtensionSystem::GetDependentExtensions(
     const Extension* extension) {
-  return scoped_ptr<ExtensionSet>();
+  return std::unique_ptr<ExtensionSet>();
 }
 
 void MockExtensionSystem::InstallUpdate(const std::string& extension_id,
                                         const base::FilePath& temp_dir) {
   NOTREACHED();
 }
 
 }  // namespace extensions