Force MimeHandlerView to always use BrowserPlugin

content/public/browser/guest_mode.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_GUEST_MODE_H_
+#define CONTENT_PUBLIC_BROWSER_GUEST_MODE_H_
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class WebContents;
+
+class CONTENT_EXPORT GuestMode {
+ public:
+  // Returns true if |web_contents| is an inner WebContents based on cross
+  // process frames.
+  static bool IsCrossProcessFrameGuest(WebContents* web_contents);
+
+ private:
+  GuestMode();
+
+  DISALLOW_COPY_AND_ASSIGN(GuestMode);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_GUEST_MODE_H_