Review and cleanup lint warnings.

fpdfsdk/src/fsdk_actionhandler.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/include/fsdk_actionhandler.h"
+
+#include <set>
+
 #include "fpdfsdk/include/fsdk_define.h"
 #include "fpdfsdk/include/fsdk_mgr.h"
 #include "fpdfsdk/include/javascript/IJavaScript.h"
 #include "third_party/base/stl_util.h"
 
 CPDFSDK_ActionHandler::CPDFSDK_ActionHandler()
     : m_pFormActionHandler(new CPDFSDK_FormActionHandler) {
 }
 
 FX_BOOL CPDFSDK_ActionHandler::DoAction_DocOpen(const CPDF_Action& action,
@@ skipping 609 matching lines @@
     const CPDF_Action& action,
     CPDFSDK_Document* pDocument) {
   CPDFSDK_InterForm* pInterForm = (CPDFSDK_InterForm*)pDocument->GetInterForm();
   if (pInterForm->DoAction_ImportData(action)) {
     pDocument->SetChangeMark();
     return TRUE;
   }
 
   return FALSE;
 }