Review and cleanup lint warnings.

fpdfsdk/src/javascript/Field.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/src/javascript/Field.h"
 
 #include <algorithm>
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "fpdfsdk/include/fsdk_mgr.h"  // For CPDFDoc_Environment.
 #include "fpdfsdk/include/javascript/IJavaScript.h"
 #include "fpdfsdk/src/javascript/Document.h"
 #include "fpdfsdk/src/javascript/Icon.h"
 #include "fpdfsdk/src/javascript/JS_Context.h"
 #include "fpdfsdk/src/javascript/JS_Define.h"
 #include "fpdfsdk/src/javascript/JS_EventHandler.h"
 #include "fpdfsdk/src/javascript/JS_Object.h"
@@ skipping 3567 matching lines @@
   }
 }
 
 void Field::AddField(CPDFSDK_Document* pDocument,
                      int nPageIndex,
                      int nFieldType,
                      const CFX_WideString& sName,
                      const CFX_FloatRect& rcCoords) {
   // Not supported.
 }