Replace safe-bool idiom with explicit WeakPtr::operator bool()

content/browser/service_worker/service_worker_provider_host.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 "content/browser/service_worker/service_worker_provider_host.h"
 
 #include <utility>
 
 #include "base/guid.h"
 #include "base/stl_util.h"
@@ skipping 621 matching lines @@
     get_ready_callback_->called = true;
     return;
   }
 }
 
 bool ServiceWorkerProviderHost::IsReadyToSendMessages() const {
   return render_thread_id_ != kInvalidEmbeddedWorkerThreadId;
 }
 
 bool ServiceWorkerProviderHost::IsContextAlive() {
-  return context_ != NULL;
+  return context_ != nullptr;
 }
 
 void ServiceWorkerProviderHost::Send(IPC::Message* message) const {
   DCHECK(dispatcher_host_);
   DCHECK(IsReadyToSendMessages());
   dispatcher_host_->Send(message);
 }
 
 void ServiceWorkerProviderHost::FinalizeInitialization(
     int process_id,
@@ skipping 15 matching lines @@
       Send(new ServiceWorkerMsg_SetControllerServiceWorker(
           render_thread_id_, provider_id(),
           GetOrCreateServiceWorkerHandle(
               associated_registration_->active_version()),
           false /* shouldNotifyControllerChange */));
     }
   }
 }
 
 }  // namespace content