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..9d98a45876843cf9da543216585d3e88501f6113 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -32,6 +32,7 @@
 #include "content/common/edit_command.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/public/browser/browser_plugin_guest_delegate.h"
+#include "content/public/browser/browser_plugin_guest_delegate_mode.h"
 #include "content/public/browser/guest_host.h"
 #include "content/public/browser/readback_types.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -156,6 +157,7 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
   // Returns the embedder's RenderWidgetHostView if it is available.
   // Returns nullptr otherwise.
   RenderWidgetHostView* GetOwnerRenderWidgetHostView();
+  RenderWidgetHostView* GetTopLevelRenderWidgetHostView();
 
   bool focused() const { return focused_; }
   bool visible() const { return guest_visible_; }
@@ -253,6 +255,13 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
 
   void ResendEventToEmbedder(const blink::WebInputEvent& event);
 
+  // TODO(ekaramad): This is used in forcing MimeHandlerView use BrowserPlugin
+  // even when --use-cross-process-frames-for-guests is used. Remove this once
+  // MimeHandlerView uses OOPIF (https://crbug.com/563285).
+  BrowserPluginGuestDelegateMode::DelegateMode delegate_mode() const {
+    return delegate_mode_;
+  }
+
  protected:
 
   // BrowserPluginGuest is a WebContentsObserver of |web_contents| and
@@ -446,6 +455,8 @@ class CONTENT_EXPORT BrowserPluginGuest : public GuestHost,
 
   BrowserPluginGuestDelegate* const delegate_;
 
+  BrowserPluginGuestDelegateMode::DelegateMode delegate_mode_;
+
   // Weak pointer used to ask GeolocationPermissionContext about geolocation
   // permission.
   base::WeakPtrFactory<BrowserPluginGuest> weak_ptr_factory_;