Force MimeHandlerView to always use BrowserPlugin

content/browser/frame_host/render_widget_host_view_child_frame.cc

 // Copyright 2014 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/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 181 matching lines @@
       return parent_view->GetVisibleViewportSize();
   }
   return GetViewBounds().size();
 }
 
 gfx::Vector2dF RenderWidgetHostViewChildFrame::GetLastScrollOffset() const {
   return last_scroll_offset_;
 }
 
 gfx::NativeView RenderWidgetHostViewChildFrame::GetNativeView() const {
-  NOTREACHED();
+  // TODO(ekaramad): To accomodate MimeHandlerViewGuest while embedded inside
+  // OOPIF-webview, we need to return the native view to be used by
+  // RenderWidgetHostViewGuest. Remove this once https://crbug.com/642826 is
+  // fixed.
+  if (frame_connector_)
+    return frame_connector_->GetParentRenderWidgetHostView()->GetNativeView();
   return nullptr;
 }
 
 gfx::NativeViewAccessible
 RenderWidgetHostViewChildFrame::GetNativeViewAccessible() {
   NOTREACHED();
   return nullptr;
 }
 
 void RenderWidgetHostViewChildFrame::SetBackgroundColor(SkColor color) {
@@ skipping 496 matching lines @@
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {
   return true;
 }
 
 cc::SurfaceId RenderWidgetHostViewChildFrame::SurfaceIdForTesting() const {
   return surface_id_;
 };
 
 }  // namespace content