Removed a redundant mouse-state from EventHandler.

Source/core/input/EventHandler.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 261 matching lines @@
 
     void resetOverscroll(bool didScrollX, bool didScrollY);
     void handleOverscroll(const ScrollResult&, const FloatPoint& position = FloatPoint(), const FloatSize& velocity = FloatSize());
 
     void customizedScroll(const Node& startNode, ScrollState&);
 
     HitTestResult hitTestResultInFrame(LocalFrame*, const LayoutPoint&, HitTestRequest::HitTestRequestType hitType = HitTestRequest::ReadOnly | HitTestRequest::Active);
 
     void invalidateClick();
 
-    void updateMouseEventTargetNode(Node*, const PlatformMouseEvent&, bool);
+    void updateMouseEventTargetNode(Node*, const PlatformMouseEvent&);
 
     /* Dispatches mouseover, mouseout, mouseenter and mouseleave events to appropriate nodes when the mouse pointer moves from one node to another. */
     void sendMouseEventsForNodeTransition(Node*, Node*, const PlatformMouseEvent&);
 
     MouseEventWithHitTestResults prepareMouseEvent(const HitTestRequest&, const PlatformMouseEvent&);
 
-    bool dispatchMouseEvent(const AtomicString& eventType, Node* target, int clickCount, const PlatformMouseEvent&, bool setUnder);
+    bool dispatchMouseEvent(const AtomicString& eventType, Node* target, int clickCount, const PlatformMouseEvent&);
     bool dispatchDragEvent(const AtomicString& eventType, Node* target, const PlatformMouseEvent&, DataTransfer*);
 
     void clearDragDataTransfer();
 
     bool handleDrag(const MouseEventWithHitTestResults&, DragInitiator);
     bool tryStartDrag(const MouseEventWithHitTestResults&);
     void clearDragState();
 
     bool dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent&);
 
@@ skipping 65 matching lines @@
     Timer<EventHandler> m_fakeMouseMoveEventTimer;
 
     bool m_svgPan;
 
     RawPtrWillBeMember<DeprecatedPaintLayerScrollableArea> m_resizeScrollableArea;
 
     RefPtrWillBeMember<Node> m_capturingMouseEventsNode;
     bool m_eventHandlerWillResetCapturingMouseEventsNode;
 
     RefPtrWillBeMember<Node> m_nodeUnderMouse;
-    RefPtrWillBeMember<Node> m_lastNodeUnderMouse;
     RefPtrWillBeMember<LocalFrame> m_lastMouseMoveEventSubframe;
     RefPtrWillBeMember<Scrollbar> m_lastScrollbarUnderMouse;
 
     int m_clickCount;
     RefPtrWillBeMember<Node> m_clickNode;
 
     RefPtrWillBeMember<Node> m_dragTarget;
     bool m_shouldOnlyFireDragOverEvent;
 
     RefPtrWillBeMember<HTMLFrameSetElement> m_frameSetBeingResized;
@@ skipping 55 matching lines @@
     // scroll which shouldn't propagate can't cause any element to
     // scroll other than the |m_previousGestureScrolledNode|.
     bool m_deltaConsumedForScrollSequence;
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::EventHandler::TouchInfo);
 
 #endif // EventHandler_h