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

extensions/browser/app_window/app_window_contents.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 "extensions/browser/app_window/app_window_contents.h"
 
 #include <string>
 #include <utility>
 
 #include "content/public/browser/browser_context.h"
@@ skipping 90 matching lines @@
   IPC_BEGIN_MESSAGE_MAP(AppWindowContentsImpl, message)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_Request, OnRequest)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_UpdateDraggableRegions,
                         UpdateDraggableRegions)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 WindowController* AppWindowContentsImpl::GetExtensionWindowController() const {
-  return NULL;
+  return nullptr;
 }
 
 content::WebContents* AppWindowContentsImpl::GetAssociatedWebContents() const {
   return web_contents_.get();
 }
 
 void AppWindowContentsImpl::OnRequest(
     const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(
       params, web_contents_->GetRenderViewHost());
 }
 
 void AppWindowContentsImpl::UpdateDraggableRegions(
     const std::vector<DraggableRegion>& regions) {
   host_->UpdateDraggableRegions(regions);
 }
 
 void AppWindowContentsImpl::SuspendRenderViewHost(
     content::RenderViewHost* rvh) {
   DCHECK(rvh);
   content::BrowserThread::PostTask(
       content::BrowserThread::IO, FROM_HERE,
       base::Bind(&content::ResourceDispatcherHost::BlockRequestsForRoute,
                  base::Unretained(content::ResourceDispatcherHost::Get()),
                  rvh->GetProcess()->GetID(), rvh->GetRoutingID()));
 }
 
 }  // namespace extensions