wtf/Vector.h included more than necessary

Source/core/html/imports/HTMLImport.cpp

 /*
  * 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.
  */
 
 #include "config.h"
 #include "core/html/imports/HTMLImport.h"
 
 #include "core/dom/Document.h"
 #include "core/html/imports/HTMLImportStateResolver.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
 HTMLImport* HTMLImport::root()
 {
     HTMLImport* i = this;
     while (i->parent())
         i = i->parent();
     return i;
 }
@@ skipping 88 matching lines @@
         child->showTree(highlight, depth + 1);
 }
 
 void HTMLImport::showThis()
 {
     fprintf(stderr, "%p state=%d", this, m_state.peekValueForDebug());
 }
 #endif
 
 } // namespace blink