Cleanup: cpplint from /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:
-  Waiter(const std::string& extension_id) : observed_(false), runner_(NULL) {}
+  explicit Waiter(const std::string& extension_id)
+      : observed_(false), runner_(NULL) {}
 
   void Wait() {
     if (observed_)
       return;
 
     runner_ = new content::MessageLoopRunner();
     runner_->Run();
   }
 
   void OnObserved() {
@@ skipping 70 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