Use tighter typing in editing/

Source/core/editing/WrapContentsInDummySpanCommand.cpp

 /*
  * Copyright (C) 2005, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * 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.
  */
 
 #include "config.h"
 #include "core/editing/WrapContentsInDummySpanCommand.h"
 
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/editing/ApplyStyleCommand.h"
-#include "core/html/HTMLElement.h"
+#include "core/html/HTMLSpanElement.h"
 
 namespace blink {
 
 WrapContentsInDummySpanCommand::WrapContentsInDummySpanCommand(PassRefPtrWillBeRawPtr<Element> element)
     : SimpleEditCommand(element->document())
     , m_element(element)
 {
     ASSERT(m_element);
 }
 
@@ skipping 46 matching lines @@
 }
 
 void WrapContentsInDummySpanCommand::trace(Visitor* visitor)
 {
     visitor->trace(m_element);
     visitor->trace(m_dummySpan);
     SimpleEditCommand::trace(visitor);
 }
 
 } // namespace blink