| Index: extensions/browser/extension_system.cc | 
| diff --git a/extensions/browser/extension_system.cc b/extensions/browser/extension_system.cc | 
| index fc2abc0a8f0eef1be6dfb1f9bab7cd2aba9e650a..dbfbb723380732adfd0cae7616bb31d820a60e1b 100644 | 
| --- a/extensions/browser/extension_system.cc | 
| +++ b/extensions/browser/extension_system.cc | 
| @@ -23,4 +23,8 @@ ExtensionSystem* ExtensionSystem::Get(content::BrowserContext* context) { | 
| ->GetForBrowserContext(context); | 
| } | 
|  | 
| +SidebarManager* ExtensionSystem::sidebar_manager() { | 
| +  return nullptr; | 
| +} | 
| + | 
| }  // namespace extensions | 
|  |