content: Cleanup class/struct forward declarations

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 20 matching lines @@
 #endif
 
 class GURL;
 
 namespace base {
 class FilePath;
 class ListValue;
 }
 
 namespace content {
-class BrowserContext;
 class ColorChooser;
-class DownloadItem;
 class JavaScriptDialogManager;
 class PageState;
 class RenderFrameHost;
 class SessionStorageNamespace;
 class WebContents;
 class WebContentsImpl;
 struct ColorSuggestion;
 struct ContextMenuParams;
 struct DropData;
 struct FileChooserParams;
 struct NativeWebKeyboardEvent;
 struct Referrer;
 struct SecurityStyleExplanations;
-struct SSLStatus;
 }  // namespace content
 
 namespace gfx {
 class Point;
 class Rect;
 class Size;
 }
 
 namespace net {
 class X509Certificate;
 }
 
-namespace url {
-class Origin;
-}
-
 namespace blink {
 class WebGestureEvent;
 }
 
 namespace content {
 class RenderWidgetHost;
 
 struct OpenURLParams;
 struct WebContentsUnresponsiveState;
 
@@ skipping 470 matching lines @@
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_