Consolidate AppControllDelegate to ExtensionsDelegate

athena/extensions/shell/extensions_delegate_impl.cc

Index: athena/extensions/shell/extensions_delegate_impl.cc
diff --git a/athena/extensions/shell/extensions_delegate_impl.cc b/athena/extensions/shell/extensions_delegate_impl.cc
index da3566cca15e2a45bf42caa7bd689cdee600b123..13161779e3f67852a7310498ea2d4471ddde70ad 100644
--- a/athena/extensions/shell/extensions_delegate_impl.cc
+++ b/athena/extensions/shell/extensions_delegate_impl.cc
@@ -30,10 +30,13 @@ class ShellExtensionsDelegate : public ExtensionsDelegate {
       shell_extensions_.Insert(extension_system_->extension());
     return shell_extensions_;
   }
-  virtual void LaunchApp(const std::string& app_id) OVERRIDE {
+  virtual bool LaunchApp(const std::string& app_id) OVERRIDE {
     extension_system_->LaunchApp();
+    return true;
   }
 
+  virtual bool UnloadApp(const std::string& app_id) OVERRIDE { return false; }
+
   content::BrowserContext* context_;
   extensions::ShellExtensionSystem* extension_system_;
   extensions::ExtensionSet shell_extensions_;