Oilpan: fix build after r351269.

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

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 35 matching lines @@
 
 InspectorDebuggerAgent::~InspectorDebuggerAgent()
 {
 #if !ENABLE(OILPAN)
     ASSERT(!m_instrumentingAgents->inspectorDebuggerAgent());
 #endif
 }
 
 DEFINE_TRACE(InspectorDebuggerAgent)
 {
-    visitor->trace(m_v8DebuggerAgent);
     visitor->trace(m_asyncCallTracker);
     InspectorBaseAgent<InspectorDebuggerAgent, InspectorFrontend::Debugger>::trace(visitor);
 }
 
 // Protocol implementation.
 void InspectorDebuggerAgent::enable(ErrorString* errorString)
 {
     m_v8DebuggerAgent->enable(errorString);
 }
 
@@ skipping 244 matching lines @@
 {
     m_v8DebuggerAgent->clearFrontend();
 }
 
 void InspectorDebuggerAgent::restore()
 {
     m_v8DebuggerAgent->restore();
 }
 
 } // namespace blink