Force MimeHandlerView to always use BrowserPlugin

content/public/browser/browser_plugin_guest_manager.h

Index: content/public/browser/browser_plugin_guest_manager.h
diff --git a/content/public/browser/browser_plugin_guest_manager.h b/content/public/browser/browser_plugin_guest_manager.h
index c809c0ff7e5e74368272a4576ce87368b857bde7..fb29611e105242511c265ce2893f9d86ac7b26aa 100644
--- a/content/public/browser/browser_plugin_guest_manager.h
+++ b/content/public/browser/browser_plugin_guest_manager.h
@@ -34,6 +34,11 @@ class CONTENT_EXPORT BrowserPluginGuestManager {
   // single BrowserPlugin in the given embedder which takes up the full page,
   // then it is returned.
   virtual WebContents* GetFullPageGuest(WebContents* embedder_web_contents);
+
+  // TODO(ekaramad): Remove this method once MimeHandlerViewGuest is implemented
+  // based on OOPIF (https://crbug.com/563285).
+  // Returns true if the given |web_contents| belongs to a MimeHandlerViewGuest.
+  virtual bool IsForMimeHandlerViewGuest(WebContents* web_contents);
 };
 
 }  // namespace content