RenderWidgetHostViewChildFrame's called a virtual in its ctor.

content/browser/frame_host/render_widget_host_view_child_frame_unittest.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 <stdint.h>
 
 #include <utility>
 
@@ skipping 78 matching lines @@
     ContextProviderFactoryImpl::Initialize(&gpu_channel_factory_);
     ui::ContextProviderFactory::SetInstance(
         ContextProviderFactoryImpl::GetInstance());
 #endif
 
     MockRenderProcessHost* process_host =
         new MockRenderProcessHost(browser_context_.get());
     int32_t routing_id = process_host->GetNextRoutingID();
     widget_host_ =
         new RenderWidgetHostImpl(&delegate_, process_host, routing_id, false);
-    view_ = new RenderWidgetHostViewChildFrame(widget_host_);
+    view_ = RenderWidgetHostViewChildFrame::Create(widget_host_);
 
     test_frame_connector_ = new MockCrossProcessFrameConnector();
     view_->SetCrossProcessFrameConnector(test_frame_connector_);
   }
 
   void TearDown() override {
     if (view_)
       view_->Destroy();
     delete widget_host_;
     delete test_frame_connector_;
@@ skipping 80 matching lines @@
 
     // Surface ID should have been passed to CrossProcessFrameConnector to
     // be sent to the embedding renderer.
     EXPECT_EQ(id, test_frame_connector_->last_surface_id_received_);
     EXPECT_EQ(view_size, test_frame_connector_->last_frame_size_received_);
     EXPECT_EQ(scale_factor, test_frame_connector_->last_scale_factor_received_);
   }
 }
 
 }  // namespace content