Rename EventContext to NodeEventContext.

Source/core/events/WindowEventContext.h

Index: Source/core/events/WindowEventContext.h
diff --git a/Source/core/events/WindowEventContext.h b/Source/core/events/WindowEventContext.h
index 25c5079c25728da2b55d35d83143d5aa62a4246e..f7c2acd4a2a794c64ff3508d5e28752ed85dea23 100644
--- a/Source/core/events/WindowEventContext.h
+++ b/Source/core/events/WindowEventContext.h
@@ -33,13 +33,13 @@ namespace WebCore {
 
 class DOMWindow;
 class EventTarget;
-class EventContext;
 class Event;
 class Node;
+class NodeEventContext;
 
 class WindowEventContext {
 public:
-    WindowEventContext(Event*, PassRefPtr<Node>, const EventContext*);
+    WindowEventContext(Event*, PassRefPtr<Node>, const NodeEventContext*);
 
     DOMWindow* window() const;
     EventTarget* target() const;