Fix crash when destroying a RenderWidgetHost that holds the pointer

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 21 matching lines @@
 namespace {
 class MockRenderWidgetHostDelegate : public RenderWidgetHostDelegate {
  public:
   MockRenderWidgetHostDelegate() {}
   ~MockRenderWidgetHostDelegate() override {}
  private:
   void Cut() override {}
   void Copy() override {}
   void Paste() override {}
   void SelectAll() override {}
+  bool HasMouseLock(RenderWidgetHostImpl*) override { return false; }
 };
 
 class MockCrossProcessFrameConnector : public CrossProcessFrameConnector {
  public:
   MockCrossProcessFrameConnector()
       : CrossProcessFrameConnector(nullptr), last_scale_factor_received_(0.f) {}
   ~MockCrossProcessFrameConnector() override {}
 
   void SetChildFrameSurface(const cc::SurfaceId& surface_id,
                             const gfx::Size& frame_size,
@@ skipping 119 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