Remove ShellExtensionSystem::LaunchApp

extensions/shell/browser/shell_extension_system.h

Index: extensions/shell/browser/shell_extension_system.h
diff --git a/extensions/shell/browser/shell_extension_system.h b/extensions/shell/browser/shell_extension_system.h
index 553a49dbee1368f77085add39feb8e841b048f81..84b7bd1068c5bfb861ff32677e3509362edba61b 100644
--- a/extensions/shell/browser/shell_extension_system.h
+++ b/extensions/shell/browser/shell_extension_system.h
@@ -39,9 +39,6 @@ class ShellExtensionSystem : public ExtensionSystem {
   // Initializes the extension system.
   void Init();
 
-  // Launch the app with id |extension_id|.
-  void LaunchApp(const std::string& extension_id);
-
   // KeyedService implementation:
   void Shutdown() override;