Remove code to defer app window appearance until first paint.

extensions/browser/app_window/app_window_contents.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CONTENTS_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 21 matching lines @@
   explicit AppWindowContentsImpl(AppWindow* host);
   ~AppWindowContentsImpl() override;
 
   // AppWindowContents
   void Initialize(content::BrowserContext* context,
                   content::RenderFrameHost* creator_frame,
                   const GURL& url) override;
   void LoadContents(int32_t creator_process_id) override;
   void NativeWindowChanged(NativeAppWindow* native_app_window) override;
   void NativeWindowClosed() override;
-  void DispatchWindowShownForTests() const override;
   void OnWindowReady() override;
   content::WebContents* GetWebContents() const override;
   WindowController* GetWindowController() const override;
 
  private:
   // content::WebContentsObserver
   bool OnMessageReceived(const IPC::Message& message) override;
   void ReadyToCommitNavigation(content::NavigationHandle* handle) override;
 
   void UpdateDraggableRegions(const std::vector<DraggableRegion>& regions);
   void SuspendRenderFrameHost(content::RenderFrameHost* rfh);
 
   AppWindow* host_;  // This class is owned by |host_|
   GURL url_;
   std::unique_ptr<content::WebContents> web_contents_;
   bool is_blocking_requests_;
   bool is_window_ready_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowContentsImpl);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CONTENTS_H_