Revert of Allow top-level navigation in extension pop-ups if it only triggers a download.

chrome/browser/extensions/extension_view_host.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_VIEW_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_VIEW_HOST_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 49 matching lines @@
 
   // ExtensionHost
   void OnDidStopFirstLoad() override;
   void LoadInitialURL() override;
   bool IsBackgroundPage() const override;
 
   // content::WebContentsDelegate
   content::WebContents* OpenURLFromTab(
       content::WebContents* source,
       const content::OpenURLParams& params) override;
-  bool ShouldTransferNavigation(bool is_main_frame_navigation) override;
   bool PreHandleKeyboardEvent(content::WebContents* source,
                               const content::NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;
   void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) override;
   bool PreHandleGestureEvent(content::WebContents* source,
                              const blink::WebGestureEvent& event) override;
   content::ColorChooser* OpenColorChooser(
       content::WebContents* web_contents,
@@ skipping 47 matching lines @@
       associated_web_contents_observer_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionViewHost);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_VIEW_HOST_H_