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

extensions/browser/guest_view/app_view/app_view_guest.cc

Index: extensions/browser/guest_view/app_view/app_view_guest.cc
diff --git a/extensions/browser/guest_view/app_view/app_view_guest.cc b/extensions/browser/guest_view/app_view/app_view_guest.cc
index ec14cc8d1471bc2be243e6d89a63805574803366..d89fd60ee03db355f207103a7950675a6e1ecf32 100644
--- a/extensions/browser/guest_view/app_view/app_view_guest.cc
+++ b/extensions/browser/guest_view/app_view/app_view_guest.cc
@@ -92,7 +92,7 @@ GuestViewBase* AppViewGuest::Create(content::BrowserContext* browser_context,
                                     int guest_instance_id) {
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
       extensions::switches::kEnableAppView)) {
-    return NULL;
+    return nullptr;
   }
   return new AppViewGuest(browser_context, guest_instance_id);
 }
@@ -109,7 +109,7 @@ AppViewGuest::~AppViewGuest() {
 }
 
 WindowController* AppViewGuest::GetExtensionWindowController() const {
-  return NULL;
+  return nullptr;
 }
 
 content::WebContents* AppViewGuest::GetAssociatedWebContents() const {
@@ -147,13 +147,13 @@ void AppViewGuest::CreateWebContents(
     const WebContentsCreatedCallback& callback) {
   std::string app_id;
   if (!create_params.GetString(appview::kAppID, &app_id)) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
-  const base::DictionaryValue* data = NULL;
+  const base::DictionaryValue* data = nullptr;
   if (!create_params.GetDictionary(appview::kData, &data)) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
@@ -165,7 +165,7 @@ void AppViewGuest::CreateWebContents(
 
   if (!guest_extension || !guest_extension->is_platform_app() ||
       !embedder_extension | !embedder_extension->is_platform_app()) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
@@ -221,7 +221,7 @@ void AppViewGuest::CompleteCreateWebContents(
     const Extension* guest_extension,
     const WebContentsCreatedCallback& callback) {
   if (!url.is_valid()) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
   url_ = url;
@@ -244,7 +244,7 @@ void AppViewGuest::LaunchAppAndFireEvent(
       extension_host->extension()->id(),
       app_runtime::OnEmbedRequested::kEventName);
   if (!has_event_listener) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }