Clean forward declaration in public

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index 28def001f841a27a383aeca695f332b60d18ba62..c6559bd922b592a19f8aa297d5fdf50ac632eb3b 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -62,7 +62,6 @@ class WebColorChooserClient;
 class WebContentDecryptionModule;
 class WebCookieJar;
 class WebDataSource;
-class WebDOMEvent;
 class WebExternalPopupMenu;
 class WebExternalPopupMenuClient;
 class WebFormElement;
@@ -72,20 +71,15 @@ class WebMediaPlayerClient;
 class WebMIDIClient;
 class WebNotificationPermissionCallback;
 class WebServiceWorkerProvider;
-class WebServiceWorkerProviderClient;
 class WebSocketHandle;
-class WebNode;
 class WebPlugin;
 class WebPluginPlaceholder;
 class WebPushClient;
 class WebRTCPeerConnectionHandler;
 class WebScreenOrientationClient;
-class WebSharedWorker;
-class WebSharedWorkerClient;
 class WebSpeechRecognizer;
 class WebString;
 class WebURL;
-class WebURLLoader;
 class WebURLResponse;
 class WebUserMediaClient;
 class WebWorkerPermissionClientProxy;
@@ -95,7 +89,6 @@ struct WebContextMenuData;
 struct WebPluginParams;
 struct WebPopupMenuInfo;
 struct WebRect;
-struct WebSize;
 struct WebTransitionElementData;
 struct WebURLError;