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

extensions/browser/app_window/app_web_contents_helper.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/app_window/app_web_contents_helper.h"
 
 #include "base/strings/stringprintf.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/page_navigator.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 33 matching lines @@
   // now we can't distinguish between those and <meta> refreshes or window.href
   // navigations, which we don't want to allow.
   // TOOD(mihaip): Can we check for user gestures instead?
   WindowOpenDisposition disposition = params.disposition;
   if (disposition == CURRENT_TAB) {
     AddMessageToDevToolsConsole(
         content::CONSOLE_MESSAGE_LEVEL_ERROR,
         base::StringPrintf(
             "Can't open same-window link to \"%s\"; try target=\"_blank\".",
             params.url.spec().c_str()));
-    return NULL;
+    return nullptr;
   }
 
   // These dispositions aren't really navigations.
   if (disposition == SUPPRESS_OPEN || disposition == SAVE_TO_DISK ||
       disposition == IGNORE_ACTION) {
-    return NULL;
+    return nullptr;
   }
 
   content::WebContents* contents =
       app_delegate_->OpenURLFromTab(browser_context_, web_contents_, params);
   if (!contents) {
     AddMessageToDevToolsConsole(
         content::CONSOLE_MESSAGE_LEVEL_ERROR,
         base::StringPrintf(
             "Can't navigate to \"%s\"; apps do not support navigation.",
             params.url.spec().c_str()));
@@ skipping 45 matching lines @@
 
 void AppWebContentsHelper::AddMessageToDevToolsConsole(
     content::ConsoleMessageLevel level,
     const std::string& message) const {
   content::RenderViewHost* rvh = web_contents_->GetRenderViewHost();
   rvh->Send(new ExtensionMsg_AddMessageToConsole(
       rvh->GetRoutingID(), level, message));
 }
 
 }  // namespace extensions