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

extensions/browser/extension_function_dispatcher.cc

Index: extensions/browser/extension_function_dispatcher.cc
diff --git a/extensions/browser/extension_function_dispatcher.cc b/extensions/browser/extension_function_dispatcher.cc
index a825d0169260f19b9939e7428d3bd7a0e211d0e5..a6ac22eb0574b14c9a8512ec0069ed94e8589c98 100644
--- a/extensions/browser/extension_function_dispatcher.cc
+++ b/extensions/browser/extension_function_dispatcher.cc
@@ -197,12 +197,12 @@ class ExtensionFunctionDispatcher::UIThreadResponseCallbackWrapper
 
 WindowController*
 ExtensionFunctionDispatcher::Delegate::GetExtensionWindowController() const {
-  return NULL;
+  return nullptr;
 }
 
 content::WebContents*
 ExtensionFunctionDispatcher::Delegate::GetAssociatedWebContents() const {
-  return NULL;
+  return nullptr;
 }
 
 content::WebContents*
@@ -297,7 +297,7 @@ void ExtensionFunctionDispatcher::Dispatch(
     RenderViewHost* render_view_host) {
   UIThreadResponseCallbackWrapperMap::const_iterator
       iter = ui_thread_response_callback_wrappers_.find(render_view_host);
-  UIThreadResponseCallbackWrapper* callback_wrapper = NULL;
+  UIThreadResponseCallbackWrapper* callback_wrapper = nullptr;
   if (iter == ui_thread_response_callback_wrappers_.end()) {
     callback_wrapper = new UIThreadResponseCallbackWrapper(AsWeakPtr(),
                                                            render_view_host);
@@ -307,7 +307,9 @@ void ExtensionFunctionDispatcher::Dispatch(
   }
 
   DispatchWithCallbackInternal(
-      params, render_view_host, NULL,
+      params,
+      render_view_host,
+      nullptr,
       callback_wrapper->CreateCallback(params.request_id));
 }
 
@@ -444,7 +446,7 @@ ExtensionFunction* ExtensionFunctionDispatcher::CreateExtensionFunction(
   if (!function) {
     LOG(ERROR) << "Unknown Extension API - " << params.name;
     SendAccessDenied(callback);
-    return NULL;
+    return nullptr;
   }
 
   function->SetArgs(&params.arguments);