Fix devtools bugs Fix a spurious layout test failure

Source/core/inspector/InspectorBaseAgent.h

 /*
  * 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 113 matching lines @@
         dispatcher->registerAgent(static_cast<AgentClass*>(this));
     }
 
 protected:
     explicit InspectorBaseAgent(const String& name)
         : InspectorAgent(name)
         , m_frontend(nullptr)
     {
     }
 
+// DART: public as hack for dart.
+public:
     FrontendClass* frontend() const { return m_frontend; }
+// DART: end of public for dart.
 
 private:
     FrontendClass* m_frontend;
 };
 
 inline bool asBool(const bool* const b)
 {
     return b ? *b : false;
 }
 
 } // namespace blink
 
 #endif // !defined(InspectorBaseAgent_h)