Code change to avoid signed/unsigned mismatch warnings

core/include/fpdfdoc/fpdf_doc.h

 // 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
 
 #ifndef CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 #define CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 
 #include <map>
@@ skipping 704 matching lines @@
   int GetDefaultSelectedItem();
 
   int CountOptions();
 
   CFX_WideString GetOptionLabel(int index);
 
   CFX_WideString GetOptionValue(int index);
 
   int FindOption(CFX_WideString csOptLabel);
 
-  int FindOptionValue(const CFX_WideString& csOptValue, int iStartIndex = 0);
+  int FindOptionValue(const CFX_WideString& csOptValue);
 
   FX_BOOL CheckControl(int iControlIndex,
                        bool bChecked,
                        bool bNotify = false);
 
   int GetTopVisibleIndex();
 
   int CountSelectedOptions();
 
   int GetSelectedOptionIndex(int index);
@@ skipping 312 matching lines @@
   CFX_WideString GetCaption(const CFX_ByteStringC& csEntry) const;
 
   CPDF_Stream* GetIcon(const CFX_ByteStringC& csEntry) const;
 
   CPDF_Dictionary* const m_pDict;
 };
 
 CFX_WideString FILESPEC_EncodeFileName(const CFX_WideStringC& filepath);
 
 #endif  // CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_