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

extensions/browser/test_extension_registry_observer.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/test_extension_registry_observer.h"
 
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "extensions/browser/extension_registry.h"
 
@@ skipping 87 matching lines @@
 
 void TestExtensionRegistryObserver::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
     UnloadedExtensionInfo::Reason reason) {
   if (extension_id_.empty() || extension->id() == extension_id_)
     unloaded_waiter_->OnObserved(extension);
 }
 
 const Extension* TestExtensionRegistryObserver::Wait(
-    scoped_ptr<Waiter>* waiter) {
+    std::unique_ptr<Waiter>* waiter) {
   waiter->get()->Wait();
   const Extension* extension = waiter->get()->extension();
   // Reset the waiter for future uses.
   // We could have a Waiter::Reset method, but it would reset every field in the
   // class, so let's just reset the pointer.
   waiter->reset(new Waiter());
   return extension;
 }
 
 }  // namespace extensions