Force MimeHandlerView to always use BrowserPlugin

content/public/browser/guest_mode.cc

+// Copyright 2016 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/browser/guest_mode.h"
+
+#include "base/command_line.h"
+#include "content/browser/browser_plugin/browser_plugin_guest.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/content_switches.h"
+
+namespace content {
+
+// static
+bool GuestMode::IsCrossProcessFrameGuest(WebContents* web_contents) {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kUseCrossProcessFramesForGuests))
+    return false;
+  BrowserPluginGuest* browser_plugin_guest =
+      static_cast<WebContentsImpl*>(web_contents)->GetBrowserPluginGuest();
+  return browser_plugin_guest &&
+         browser_plugin_guest->can_use_cross_process_frames();
+}
+
+}  // namespace content