refactor: replace remaining NULL with nullptr (#40053)

refactor: use nullptr everywhere

shell/browser/extensions/electron_extension_message_filter.h

@@ -62,7 +62,7 @@ class ElectronExtensionMessageFilter : public content::BrowserMessageFilter {
 
   // The BrowserContext associated with our renderer process.  This should only
   // be accessed on the UI thread! Furthermore since this class is refcounted it
-  // may outlive |browser_context_|, so make sure to NULL check if in doubt;
+  // may outlive |browser_context_|, so make sure to nullptr check if in doubt;
   // async calls and the like.
   raw_ptr<content::BrowserContext> browser_context_;
 };

shell/browser/extensions/electron_extension_system.cc

@@ -95,7 +95,8 @@ void ElectronExtensionSystem::InitForRegularProfile(bool extensions_enabled) {
 std::unique_ptr<base::Value::Dict> ParseManifest(
     base::StringPiece manifest_contents) {
   JSONStringValueDeserializer deserializer(manifest_contents);
-  std::unique_ptr<base::Value> manifest = deserializer.Deserialize(NULL, NULL);
+  std::unique_ptr<base::Value> manifest =
+      deserializer.Deserialize(nullptr, nullptr);
 
   if (!manifest.get() || !manifest->is_dict()) {
     LOG(ERROR) << "Failed to parse extension manifest.";