Force MimeHandlerView to always use BrowserPlugin

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index ccfb0b990d3b2ee748ae053495a6f266f796ef71..ddc8ab27a49304ce655000d77020cd807454b0f4 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -253,6 +253,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
 
   void ResendEventToEmbedder(const blink::WebInputEvent& event);
 
+  // TODO(ekaramad): Remove this once https://crbug.com/642826 is resolved.
+  bool can_use_cross_process_frames() const {
+    return can_use_cross_process_frames_;
+  }
+
  protected:
 
   // BrowserPluginGuest is a WebContentsObserver of |web_contents| and
@@ -446,6 +451,11 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
 
   BrowserPluginGuestDelegate* const delegate_;
 
+  // Whether or not this BrowserPluginGuest can use cross process frames. This
+  // means when we have --use-cross-process-frames-for-guests on, the
+  // WebContents associated with this BrowserPluginGuest has OOPIF structure.
+  bool can_use_cross_process_frames_;
+
   // Weak pointer used to ask GeolocationPermissionContext about geolocation
   // permission.
   base::WeakPtrFactory<BrowserPluginGuest> weak_ptr_factory_;