Force MimeHandlerView to always use BrowserPlugin

content/public/common/browser_plugin_guest_mode.cc

 // Copyright 2015 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 "content/public/common/browser_plugin_guest_mode.h"
 
 #include "base/command_line.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_plugin_guest_manager.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 
 namespace content {
 
 // static
 bool BrowserPluginGuestMode::UseCrossProcessFramesForGuests() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kUseCrossProcessFramesForGuests);
 }
 
+bool BrowserPluginGuestMode::UseCrossProcessFramesForWebContents(
+    content::WebContents* web_contents) {
+  return UseCrossProcessFramesForGuests() &&
+         !web_contents->GetBrowserContext()
+              ->GetGuestManager()
+              ->IsForMimeHandlerViewGuest(web_contents);
+}
+
 }  // namespace content