Run clang-modernize -use-nullptr over src/extensions/.

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 "content/public/test/test_utils.h"
 #include "extensions/browser/extension_registry.h"
 
 namespace extensions {
 
 class TestExtensionRegistryObserver::Waiter {
  public:
   explicit Waiter(const std::string& extension_id)
-      : observed_(false), runner_(NULL) {}
+      : observed_(false), runner_(nullptr) {}
 
   void Wait() {
     if (observed_)
       return;
 
     runner_ = new content::MessageLoopRunner();
     runner_->Run();
   }
 
   void OnObserved() {
     observed_ = true;
 
     if (runner_.get()) {
       runner_->Quit();
-      runner_ = NULL;
+      runner_ = nullptr;
     }
   }
 
  private:
   bool observed_;
   scoped_refptr<content::MessageLoopRunner> runner_;
 
   DISALLOW_COPY_AND_ASSIGN(Waiter);
 };
 
@@ skipping 55 matching lines @@
 
 void TestExtensionRegistryObserver::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
     UnloadedExtensionInfo::Reason reason) {
   if (extension->id() == extension_id_)
     unloaded_waiter_->OnObserved();
 }
 
 }  // namespace extensions