Force MimeHandlerView to always use BrowserPlugin

components/guest_view/browser/guest_view_manager.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 "components/guest_view/browser/guest_view_manager.h"
 
 #include <tuple>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 219 matching lines @@
 }
 
 WebContents* GuestViewManager::GetFullPageGuest(
     WebContents* embedder_web_contents) {
   WebContents* result = nullptr;
   ForEachGuest(embedder_web_contents,
                base::Bind(&GuestViewManager::GetFullPageGuestHelper, &result));
   return result;
 }
 
+bool GuestViewManager::IsForMimeHandlerViewGuest(
+    content::WebContents* web_contents) {
+  GuestViewBase* guest = GuestViewBase::FromWebContents(web_contents);
+  return guest && guest->IsMimeHandlerViewGuest();
+}
+
 void GuestViewManager::AddGuest(int guest_instance_id,
                                 WebContents* guest_web_contents) {
   CHECK(!ContainsKey(guest_web_contents_by_instance_id_, guest_instance_id));
   CHECK(CanUseGuestInstanceID(guest_instance_id));
   guest_web_contents_by_instance_id_[guest_instance_id] = guest_web_contents;
 
   delegate_->OnGuestAdded(guest_web_contents);
 }
 
 void GuestViewManager::RemoveGuest(int guest_instance_id) {
@@ skipping 244 matching lines @@
     const GuestViewCreateFunction& create_function,
     const GuestViewCleanUpFunction& cleanup_function)
     : create_function(create_function), cleanup_function(cleanup_function) {}
 
 GuestViewManager::GuestViewData::GuestViewData(const GuestViewData& other) =
     default;
 
 GuestViewManager::GuestViewData::~GuestViewData() {}
 
 }  // namespace guest_view