Clean up forward declarations in Source/core/frame

Source/core/frame/LocalDOMWindow.h

Index: Source/core/frame/LocalDOMWindow.h
diff --git a/Source/core/frame/LocalDOMWindow.h b/Source/core/frame/LocalDOMWindow.h
index 9f6157a9194838927cfec04abac7fc53b9a4e848..cce578cbad017dc12cd3c2bd7da128fdd64cfded 100644
--- a/Source/core/frame/LocalDOMWindow.h
+++ b/Source/core/frame/LocalDOMWindow.h
@@ -46,13 +46,10 @@ class CSSRuleList;
 class CSSStyleDeclaration;
 class Console;
 class DOMSelection;
-class DOMURL;
 class DOMWindowCSS;
 class DOMWindowEventQueue;
 class DOMWindowLifecycleNotifier;
 class DOMWindowProperty;
-class Database;
-class DatabaseCallback;
 class Document;
 class DocumentInit;
 class Element;
@@ -62,18 +59,14 @@ class ExceptionState;
 class FloatRect;
 class FrameConsole;
 class History;
-class IDBFactory;
 class LocalFrame;
 class Location;
 class MediaQueryList;
-class MessageEvent;
 class Navigator;
-class Node;
 class Page;
 class Performance;
 class PostMessageTimer;
 class RequestAnimationFrameCallback;
-class ScheduledAction;
 class Screen;
 class ScriptCallStack;
 class SecurityOrigin;
@@ -81,8 +74,6 @@ class SerializedScriptValue;
 class Storage;
 class StyleMedia;
 
-struct WindowFeatures;
-
 typedef WillBeHeapVector<RefPtrWillBeMember<MessagePort>, 1> MessagePortArray;
 
 enum PageshowEventPersistence {