Break dependency between ChromeClient and WebViewImpl, and ChromeClientImpl.

third_party/WebKit/Source/core/page/ChromeClient.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple, Inc. All rights
  * reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 309 matching lines @@
   virtual void RegisterViewportLayers() const {}
 
   virtual void ShowUnhandledTapUIIfNeeded(IntPoint, Node*, bool) {}
 
   virtual void OnMouseDown(Node&) {}
 
   virtual void DidUpdateBrowserControls() const {}
 
   virtual void RegisterPopupOpeningObserver(PopupOpeningObserver*) = 0;
   virtual void UnregisterPopupOpeningObserver(PopupOpeningObserver*) = 0;
+  virtual void NotifyPopupOpeningObservers() const = 0;
 
   virtual CompositorWorkerProxyClient* CreateCompositorWorkerProxyClient(
       LocalFrame*) = 0;
   virtual AnimationWorkletProxyClient* CreateAnimationWorkletProxyClient(
       LocalFrame*) = 0;
 
   virtual FloatSize ElasticOverscroll() const { return FloatSize(); }
 
   // Called when observed XHR, fetch, and other fetch request with non-GET
   // method is initiated from javascript. At this time, it is not guaranteed
@@ skipping 37 matching lines @@
   WeakMember<Node> last_mouse_over_node_;
   LayoutPoint last_tool_tip_point_;
   String last_tool_tip_text_;
 
   FRIEND_TEST_ALL_PREFIXES(ChromeClientTest, SetToolTipFlood);
 };
 
 }  // namespace blink
 
 #endif  // ChromeClient_h