Allow MimeHandlerViewGuest be embedded inside OOPIFs

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 317 matching lines @@
 }
 
 void RenderWidgetHostViewChildFrame::UnregisterFrameSinkId() {
   DCHECK(host_);
   if (host_->delegate() && host_->delegate()->GetInputEventRouter()) {
     host_->delegate()->GetInputEventRouter()->RemoveFrameSinkIdOwner(
         frame_sink_id_);
   }
 }
 
+RenderWidgetHostViewBase*
+RenderWidgetHostViewChildFrame::GetOwnerRenderWidgetHostView() const {
+  NOTREACHED();
+  return nullptr;
+}
+
 void RenderWidgetHostViewChildFrame::GestureEventAck(
     const blink::WebGestureEvent& event,
     InputEventAckState ack_result) {
   bool not_consumed = ack_result == INPUT_EVENT_ACK_STATE_NOT_CONSUMED ||
                       ack_result == INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
   // GestureScrollBegin is consumed by the target frame and not forwarded,
   // because we don't know whether we will need to bubble scroll until we
   // receive a GestureScrollUpdate ACK. GestureScrollUpdate with unused
   // scroll extent is forwarded for bubbling, while GestureScrollEnd is
   // always forwarded and handled according to current scroll state in the
@@ skipping 390 matching lines @@
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {
   return true;
 }
 
 cc::SurfaceId RenderWidgetHostViewChildFrame::SurfaceIdForTesting() const {
   return cc::SurfaceId(frame_sink_id_, local_frame_id_);
 };
 
 }  // namespace content