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

extensions/browser/api/system_storage/system_storage_apitest.cc

 // Copyright 2013 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 <stddef.h>
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 84 matching lines @@
     StorageMonitor::GetInstance()->receiver()->ProcessAttach(
         extensions::test::BuildStorageInfoFromTestStorageUnitInfo(
             removable_storage_info));
   }
 
   void DetachRemovableStorage(const std::string& id) {
     StorageMonitor::GetInstance()->receiver()->ProcessDetach(id);
   }
 
  private:
-  scoped_ptr<base::MessageLoop> message_loop_;
+  std::unique_ptr<base::MessageLoop> message_loop_;
 };
 
 IN_PROC_BROWSER_TEST_F(SystemStorageApiTest, Storage) {
   SetUpAllMockStorageDevices();
   TestStorageInfoProvider* provider =
       new TestStorageInfoProvider(kTestingData, arraysize(kTestingData));
   extensions::StorageInfoProvider::InitializeForTesting(provider);
   std::vector<linked_ptr<ExtensionTestMessageListener>> device_ids_listeners;
   for (size_t i = 0; i < arraysize(kTestingData); ++i) {
     linked_ptr<ExtensionTestMessageListener> listener(
@@ skipping 26 matching lines @@
       removable_storage_transient_id, false);
 
   // Simulate triggering onDetached event.
   ASSERT_TRUE(detach_listener.WaitUntilSatisfied());
   DetachRemovableStorage(kRemovableStorageData.device_id);
 
   ASSERT_TRUE(detach_device_id_listener.WaitUntilSatisfied());
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
 }