Clean up forward declarations in Source/core/events

These forward references are not needed anymore. After
this patch, Source/core/events has no unneeded forward references
any more.

Review URL: https://codereview.chromium.org/656683009

git-svn-id: svn://svn.chromium.org/blink/trunk@183935 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/events/DOMWindowEventQueue.h

@@ -37,7 +37,6 @@ namespace blink {
 
 class Event;
 class DOMWindowEventQueueTimer;
-class Node;
 class ExecutionContext;
 
 #if ENABLE(OILPAN)

third_party/WebKit/Source/core/events/Event.h

@@ -34,7 +34,6 @@
 namespace blink {
 
 class EventTarget;
-class EventDispatcher;
 class ExecutionContext;
 
 struct EventInit {

third_party/WebKit/Source/core/events/EventDispatchMediator.h

@@ -40,7 +40,6 @@ namespace blink {
 
 class Event;
 class EventDispatcher;
-class Node;
 
 class EventDispatchMediator : public RefCountedWillBeGarbageCollectedFinalized<EventDispatchMediator> {
 public:

third_party/WebKit/Source/core/events/EventListener.h

@@ -25,7 +25,6 @@
 
 namespace blink {
 
-    class DOMWrapperWorld;
     class Event;
     class ExecutionContext;
 

third_party/WebKit/Source/core/events/EventTarget.h

@@ -44,10 +44,6 @@ class Event;
 class ExceptionState;
 class MessagePort;
 class Node;
-class TextTrack;
-class TextTrackCue;
-class XMLHttpRequest;
-class XMLHttpRequestUpload;
 
 struct FiringEventIterator {
     FiringEventIterator(const AtomicString& eventType, size_t& iterator, size_t& end)

third_party/WebKit/Source/core/events/FocusEvent.h

@@ -31,8 +31,6 @@
 
 namespace blink {
 
-class Node;
-
 struct FocusEventInit : public UIEventInit {
     FocusEventInit();
 

third_party/WebKit/Source/core/events/KeyboardEvent.h

@@ -30,7 +30,6 @@
 namespace blink {
 
 class EventDispatcher;
-class Node;
 class PlatformKeyboardEvent;
 
 struct KeyboardEventInit : public UIEventInit {

third_party/WebKit/Source/core/html/track/TextTrackCue.h

@@ -39,6 +39,8 @@
 
 namespace blink {
 
+class TextTrack;
+
 class TextTrackCue : public RefCountedWillBeGarbageCollectedFinalized<TextTrackCue>, public EventTargetWithInlineData {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_EVENT_TARGET(TextTrackCue);

third_party/WebKit/Source/core/xml/XMLHttpRequest.h

@@ -53,6 +53,7 @@ class Stream;
 class TextResourceDecoder;
 class ThreadableLoader;
 class UnderlyingSource;
+class XMLHttpRequestUpload;
 
 typedef int ExceptionCode;