Fix crash when destroying a RenderWidgetHost that holds the pointer

content/browser/renderer_host/render_widget_host_unittest.cc

 // Copyright (c) 2012 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 <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <tuple>
 
@@ skipping 395 matching lines @@
   }
 
   void RendererUnresponsive(RenderWidgetHostImpl* render_widget_host) override {
     unresponsive_timer_fired_ = true;
   }
 
   void Cut() override {}
   void Copy() override {}
   void Paste() override {}
   void SelectAll() override {}
+  bool HasMouseLock(RenderWidgetHostImpl*) override { return false; }
 
  private:
   bool prehandle_keyboard_event_;
   bool prehandle_keyboard_event_is_shortcut_;
   bool prehandle_keyboard_event_called_;
   WebInputEvent::Type prehandle_keyboard_event_type_;
 
   bool unhandled_keyboard_event_called_;
   WebInputEvent::Type unhandled_keyboard_event_type_;
 
@@ skipping 1248 matching lines @@
                                       ui::LatencyInfo());
 
 
   // Tests RWHI::ForwardWheelEventWithLatencyInfo().
   SimulateWheelEventWithLatencyInfo(-5, 0, 0, true, ui::LatencyInfo());
 
   ASSERT_FALSE(host_->input_router()->HasPendingEvents());
 }
 
 }  // namespace content