Review and cleanup lint warnings.

fpdfsdk/src/fxedit/fxet_list.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/fxedit/fxet_list.h"
+
+#include <string>
+
 #include "fpdfsdk/include/fxedit/fxet_edit.h"
-#include "fpdfsdk/include/fxedit/fxet_list.h"
 
 CFX_ListItem::CFX_ListItem()
     : m_pEdit(NULL),
       m_bSelected(FALSE),
       m_bCaret(FALSE),
       m_rcListItem(0.0f, 0.0f, 0.0f, 0.0f) {
   m_pEdit = IFX_Edit::NewEdit();
   m_pEdit->SetAlignmentV(1);
   m_pEdit->Initialize();
 }
@@ skipping 793 matching lines @@
 
 int32_t CFX_ListCtrl::GetItemIndex(const CFX_FloatPoint& point) const {
   return CFX_List::GetItemIndex(OutToIn(point));
 }
 
 CFX_WideString CFX_ListCtrl::GetText() const {
   if (IsMultipleSel())
     return GetItemText(m_nCaretIndex);
   return GetItemText(m_nSelItem);
 }