Review and cleanup lint warnings.

fpdfsdk/src/pdfwindow/PWL_Note.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/pdfwindow/PWL_Note.h"
 
+#include <string>
+
 #include "fpdfsdk/include/pdfwindow/PWL_Button.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Caret.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Edit.h"
 #include "fpdfsdk/include/pdfwindow/PWL_EditCtrl.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Label.h"
 #include "fpdfsdk/include/pdfwindow/PWL_ListCtrl.h"
 #include "fpdfsdk/include/pdfwindow/PWL_ScrollBar.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
 
@@ skipping 1484 matching lines @@
   m_pContents->EnableRead(bEnabled);
 }
 
 CFX_WideString CPWL_Note::GetReplyString() const {
   return m_sReplyString;
 }
 
 void CPWL_Note::SetReplyString(const CFX_WideString& string) {
   m_sReplyString = string;
 }