Remove code to defer app window appearance until first paint.

extensions/browser/app_window/app_window_contents.cc

Index: extensions/browser/app_window/app_window_contents.cc
diff --git a/extensions/browser/app_window/app_window_contents.cc b/extensions/browser/app_window/app_window_contents.cc
index e40be766e08c687e8f59dc5cc29e4ce2e20b9f50..b09d7c94a9c6f41a46d89d455363e21ee3ec780d 100644
--- a/extensions/browser/app_window/app_window_contents.cc
+++ b/extensions/browser/app_window/app_window_contents.cc
@@ -82,14 +82,6 @@ void AppWindowContentsImpl::NativeWindowClosed() {
   rvh->Send(new ExtensionMsg_AppWindowClosed(rvh->GetRoutingID()));
 }
 
-void AppWindowContentsImpl::DispatchWindowShownForTests() const {
-  base::ListValue args;
-  content::RenderFrameHost* rfh = web_contents_->GetMainFrame();
-  rfh->Send(new ExtensionMsg_MessageInvoke(rfh->GetRoutingID(),
-                                           host_->extension_id(), "app.window",
-                                           "appWindowShownForTests", args));
-}
-
 void AppWindowContentsImpl::OnWindowReady() {
   is_window_ready_ = true;
   if (is_blocking_requests_) {