[DevTools] Consolidate overlay-related functionality in Overlay domain

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

Index: third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h b/third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h
index 0d5d4be368563e7f4d20180b386672c7a7f8c2ac..167833c460b40a450d2df7c6b417cc0828540859 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorOverlayHost.h
@@ -40,23 +40,20 @@ class CORE_EXPORT InspectorOverlayHost final
   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; }
 
- private:
-  InspectorOverlayHost();
+  explicit InspectorOverlayHost(Listener*);
+  DECLARE_TRACE();
 
+  void resume();
+  void stepOver();
+
+ private:
   Member<Listener> listener_;
 };