[DevTools] Consolidate overlay-related functionality in Overlay domain

third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 22 matching lines @@
 #include "core/CoreExport.h"
 
 namespace blink {
 
 class CORE_EXPORT InspectorOverlayHost final
     : public GarbageCollected<InspectorOverlayHost>,
       public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
-  static InspectorOverlayHost* Create() { return new InspectorOverlayHost(); }
-  DECLARE_TRACE();
-
-  void resume();
-  void stepOver();
-
   class Listener : public GarbageCollectedMixin {
    public:
     virtual ~Listener() {}
     virtual void OverlayResumed() = 0;
     virtual void OverlaySteppedOver() = 0;
   };
-  void SetListener(Listener* listener) { listener_ = listener; }
+
+  explicit InspectorOverlayHost(Listener*);
+  DECLARE_TRACE();
+
+  void resume();
+  void stepOver();
 
  private:
-  InspectorOverlayHost();
-
   Member<Listener> listener_;
 };
 
 }  // namespace blink
 
 #endif  // InspectorOverlayHost_h