Oilpan: fix build after r351269.

third_party/WebKit/Source/core/inspector/InspectorDOMDebuggerAgent.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 95 matching lines @@
 {
 #if !ENABLE(OILPAN)
     ASSERT(!m_instrumentingAgents->inspectorDOMDebuggerAgent());
 #endif
 }
 
 DEFINE_TRACE(InspectorDOMDebuggerAgent)
 {
     visitor->trace(m_injectedScriptManager);
     visitor->trace(m_domAgent);
-    visitor->trace(m_debuggerAgent);
 #if ENABLE(OILPAN)
     visitor->trace(m_domBreakpoints);
 #endif
     InspectorBaseAgent::trace(visitor);
 }
 
 void InspectorDOMDebuggerAgent::disable(ErrorString*)
 {
     setEnabled(false);
     m_domBreakpoints.clear();
@@ skipping 551 matching lines @@
         m_instrumentingAgents->setInspectorDOMDebuggerAgent(nullptr);
     }
 }
 
 void InspectorDOMDebuggerAgent::didCommitLoadForLocalFrame(LocalFrame*)
 {
     m_domBreakpoints.clear();
 }
 
 } // namespace blink