Refactor ShellDesktopController and ShellNativeAppWindow to allow for non-aura implementations.

extensions/shell/browser/shell_app_window_client.cc

Index: extensions/shell/browser/shell_app_window_client.cc
diff --git a/extensions/shell/browser/shell_app_window_client.cc b/extensions/shell/browser/shell_app_window_client.cc
index 293f58b91c7dc427f5c2bc6f0638ef2a2daafaad..8ad167073386540661e6eec64a2cf449072a70dc 100644
--- a/extensions/shell/browser/shell_app_window_client.cc
+++ b/extensions/shell/browser/shell_app_window_client.cc
@@ -8,7 +8,6 @@
 
 #include "extensions/browser/app_window/app_window.h"
 #include "extensions/shell/browser/desktop_controller.h"
-#include "extensions/shell/browser/shell_native_app_window.h"
 
 namespace extensions {
 
@@ -24,16 +23,6 @@ AppWindow* ShellAppWindowClient::CreateAppWindow(
   return DesktopController::instance()->CreateAppWindow(context, extension);
 }
 
-NativeAppWindow* ShellAppWindowClient::CreateNativeAppWindow(
-      AppWindow* window,
-      AppWindow::CreateParams* params) {
-  ShellNativeAppWindow* native_app_window =
-      new ShellNativeAppWindow(window, *params);
-  DesktopController::instance()->AddAppWindow(
-      native_app_window->GetNativeWindow());
-  return native_app_window;
-}
-
 void ShellAppWindowClient::OpenDevToolsWindow(
     content::WebContents* web_contents,
     const base::Closure& callback) {