Force MimeHandlerView to always use BrowserPlugin

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h

 // Copyright 2014 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_GUEST_VIEW_MIME_HANDLER_VIEW_MIME_HANDLER_VIEW_GUEST_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_MIME_HANDLER_VIEW_MIME_HANDLER_VIEW_GUEST_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/guest_view/browser/guest_view.h"
@@ skipping 40 matching lines @@
 };
 
 class MimeHandlerViewGuest :
     public guest_view::GuestView<MimeHandlerViewGuest> {
  public:
   static guest_view::GuestViewBase* Create(
       content::WebContents* owner_web_contents);
 
   static const char Type[];
 
+  bool IsMimeHandlerViewGuest() override;
+
  protected:
   explicit MimeHandlerViewGuest(content::WebContents* owner_web_contents);
   ~MimeHandlerViewGuest() override;
 
  private:
   friend class TestMimeHandlerViewGuest;
 
   // GuestViewBase implementation.
   const char* GetAPINamespace() const final;
   int GetTaskPrefix() const final;
@@ skipping 26 matching lines @@
   std::unique_ptr<MimeHandlerViewGuestDelegate> delegate_;
   std::unique_ptr<StreamContainer> stream_;
   std::string view_id_;
 
   DISALLOW_COPY_AND_ASSIGN(MimeHandlerViewGuest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_MIME_HANDLER_VIEW_MIME_HANDLER_VIEW_GUEST_H_