Force MimeHandlerView to always use BrowserPlugin

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc

 // 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.
 
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
 
 #include <utility>
 
 #include "base/strings/stringprintf.h"
 #include "components/guest_view/common/guest_view_constants.h"
@@ skipping 64 matching lines @@
 }
 
 MimeHandlerViewGuest::MimeHandlerViewGuest(WebContents* owner_web_contents)
     : GuestView<MimeHandlerViewGuest>(owner_web_contents),
       delegate_(ExtensionsAPIClient::Get()->CreateMimeHandlerViewGuestDelegate(
           this)) {}
 
 MimeHandlerViewGuest::~MimeHandlerViewGuest() {
 }
 
+bool MimeHandlerViewGuest::IsMimeHandlerViewGuest() {
+  return true;
+}
+
 const char* MimeHandlerViewGuest::GetAPINamespace() const {
   return "mimeHandlerViewGuestInternal";
 }
 
 int MimeHandlerViewGuest::GetTaskPrefix() const {
   return IDS_EXTENSION_TASK_MANAGER_MIMEHANDLERVIEW_TAG_PREFIX;
 }
 
 void MimeHandlerViewGuest::CreateWebContents(
     const base::DictionaryValue& create_params,
@@ skipping 141 matching lines @@
           element_instance_id()));
 }
 
 base::WeakPtr<StreamContainer> MimeHandlerViewGuest::GetStream() const {
   if (!stream_)
     return base::WeakPtr<StreamContainer>();
   return stream_->GetWeakPtr();
 }
 
 }  // namespace extensions