[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/app_window/app_window.cc

Index: extensions/browser/app_window/app_window.cc
diff --git a/extensions/browser/app_window/app_window.cc b/extensions/browser/app_window/app_window.cc
index c1959a98c82541c665e543ff7fba235de8b74b5f..4aa2dea923e61f3e6eb79c37cab1b8c13c305e3e 100644
--- a/extensions/browser/app_window/app_window.cc
+++ b/extensions/browser/app_window/app_window.cc
@@ -30,6 +30,7 @@
 #include "extensions/browser/app_window/size_constraints.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
+#include "extensions/browser/extension_web_contents_observer.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/notification_types.h"
 #include "extensions/browser/process_manager.h"
@@ -258,6 +259,9 @@ void AppWindow::Init(const GURL& url,
   SetViewType(web_contents(), VIEW_TYPE_APP_WINDOW);
   app_delegate_->InitWebContents(web_contents());
 
+  ExtensionWebContentsObserver::GetForWebContents(web_contents())->
+      dispatcher()->set_delegate(this);
+
   WebContentsModalDialogManager::CreateForWebContents(web_contents());
 
   web_contents()->SetDelegate(this);
@@ -922,6 +926,14 @@ blink::WebDisplayMode AppWindow::GetDisplayMode(
                         : blink::WebDisplayModeStandalone;
 }
 
+WindowController* AppWindow::GetExtensionWindowController() const {
+  return app_window_contents_->GetWindowController();
+}
+
+content::WebContents* AppWindow::GetAssociatedWebContents() const {
+  return web_contents();
+}
+
 void AppWindow::OnExtensionUnloaded(BrowserContext* browser_context,
                                     const Extension* extension,
                                     UnloadedExtensionInfo::Reason reason) {