[HTML Imports] Let script of imported document running.

Source/core/html/HTMLImport.h

 /*
  * Copyright (C) 2013 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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef HTMLImport_h
 #define HTMLImport_h
 
 namespace WebCore {
 
+class Frame;
 class Document;
 class Frame;
 class HTMLImportsController;
 
 class HTMLImport {
 public:
     virtual ~HTMLImport() { }
 
     bool haveChildrenLoaded();
     Frame* frame();
     Document* master();
 
     virtual HTMLImportsController* controller() = 0;
     virtual HTMLImport* parent() = 0;
     virtual Document* document() = 0;
     virtual void wasDetachedFromDocument() = 0;
     virtual void didFinishParsing() = 0;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImport_h