Introduce chrome.shell.createWindow stub API for app_shell

chrome/test/base/chrome_render_view_test.h

Index: chrome/test/base/chrome_render_view_test.h
diff --git a/chrome/test/base/chrome_render_view_test.h b/chrome/test/base/chrome_render_view_test.h
index 69bd244d76e2ee26b266963fab170cd03d2be274..5c4824f2cd9ad41bef072d051e206d5a8b83b4e9 100644
--- a/chrome/test/base/chrome_render_view_test.h
+++ b/chrome/test/base/chrome_render_view_test.h
@@ -16,10 +16,6 @@ class TestPasswordAutofillAgent;
 class TestPasswordGenerationAgent;
 }
 
-namespace extensions {
-class Dispatcher;
-}
-
 class ChromeRenderViewTest : public content::RenderViewTest {
  public:
   ChromeRenderViewTest();
@@ -34,8 +30,6 @@ class ChromeRenderViewTest : public content::RenderViewTest {
   virtual content::ContentRendererClient*
       CreateContentRendererClient() OVERRIDE;
 
-  extensions::Dispatcher* extension_dispatcher_;
-
   autofill::TestPasswordAutofillAgent* password_autofill_;
   autofill::TestPasswordGenerationAgent* password_generation_;
   autofill::AutofillAgent* autofill_agent_;