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

extensions/browser/guest_view/extension_options/extension_options_guest.cc

Index: extensions/browser/guest_view/extension_options/extension_options_guest.cc
diff --git a/extensions/browser/guest_view/extension_options/extension_options_guest.cc b/extensions/browser/guest_view/extension_options/extension_options_guest.cc
index 759e48d39cbc11d5ea13f84eafbcfe527f345648..7ca7de636cc0867436133b21524387dc5c89fdeb 100644
--- a/extensions/browser/guest_view/extension_options/extension_options_guest.cc
+++ b/extensions/browser/guest_view/extension_options/extension_options_guest.cc
@@ -51,7 +51,7 @@ extensions::GuestViewBase* ExtensionOptionsGuest::Create(
     content::BrowserContext* browser_context,
     int guest_instance_id) {
   if (!extensions::FeatureSwitch::embedded_extension_options()->IsEnabled()) {
-    return NULL;
+    return nullptr;
   }
   return new ExtensionOptionsGuest(browser_context, guest_instance_id);
 }
@@ -66,21 +66,21 @@ void ExtensionOptionsGuest::CreateWebContents(
   create_params.GetString(extensionoptions::kExtensionId, &extension_id);
 
   if (!crx_file::id_util::IdIsValid(extension_id)) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
   if (crx_file::id_util::IdIsValid(embedder_extension_id) &&
       extension_id != embedder_extension_id) {
     // Extensions cannot embed other extensions' options pages.
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
   GURL extension_url =
       extensions::Extension::GetBaseURLFromExtensionId(extension_id);
   if (!extension_url.is_valid()) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
@@ -91,7 +91,7 @@ void ExtensionOptionsGuest::CreateWebContents(
       registry->enabled_extensions().GetByID(extension_id);
   options_page_ = extensions::OptionsPageInfo::GetOptionsPage(extension);
   if (!options_page_.is_valid()) {
-    callback.Run(NULL);
+    callback.Run(nullptr);
     return;
   }
 
@@ -159,7 +159,7 @@ content::WebContents* ExtensionOptionsGuest::OpenURLFromTab(
     content::WebContents* source,
     const content::OpenURLParams& params) {
   if (!extension_options_guest_delegate_)
-    return NULL;
+    return nullptr;
 
   // Don't allow external URLs with the CURRENT_TAB disposition be opened in
   // this guest view, change the disposition to NEW_FOREGROUND_TAB.