Clean forward declaration in public

public/platform/WebApplicationCacheHost.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef WebApplicationCacheHost_h
 #define WebApplicationCacheHost_h
 
 #include "WebCommon.h"
 #include "WebURL.h"
 #include "WebVector.h"
 
 namespace blink {
 
-class WebApplicationCacheHostClient;
 class WebURL;
 class WebURLRequest;
 class WebURLResponse;
-struct WebURLError;
 
 // This interface is used by webkit to call out to the embedder. Webkit uses
 // the WebFrameClient::createApplicationCacheHost method to create instances,
 // and calls delete when the instance is no longer needed.
 class WebApplicationCacheHost {
 public:
     // These values must match blink::ApplicationCacheHost::Status values
     enum Status {
         Uncached,
         Idle,
@@ skipping 68 matching lines @@
         ResourceInfo() : size(0), isMaster(false), isManifest(false), isExplicit(false), isForeign(false), isFallback(false) { }
     };
     virtual void getAssociatedCacheInfo(CacheInfo*) { }
     virtual void getResourceList(WebVector<ResourceInfo>*) { }
     virtual void deleteAssociatedCacheGroup() { }
 };
 
 } // namespace blink
 
 #endif // WebApplicationCacheHost_h