Fix all the code which has duplicate variable declarations

fpdfsdk/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/javascript/Field.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 126 matching lines @@
                            int& iControlNo) {
   int iStart = strFieldNameParsed.find_last_of(L'.');
   if (iStart == -1) {
     strFieldName = strFieldNameParsed;
     iControlNo = -1;
     return;
   }
   std::wstring suffixal = strFieldNameParsed.substr(iStart + 1);
   iControlNo = FXSYS_wtoi(suffixal.c_str());
   if (iControlNo == 0) {
-    int iStart;
-    while ((iStart = suffixal.find_last_of(L" ")) != -1) {
-      suffixal.erase(iStart, 1);
+    int iSpaceStart;
+    while ((iSpaceStart = suffixal.find_last_of(L" ")) != -1) {
+      suffixal.erase(iSpaceStart, 1);
     }
 
     if (suffixal.compare(L"0") != 0) {
       strFieldName = strFieldNameParsed;
       iControlNo = -1;
       return;
     }
   }
   strFieldName = strFieldNameParsed.substr(0, iStart);
 }
@@ skipping 82 matching lines @@
     pDocument->SetChangeMark();
 }
 
 void Field::UpdateFormControl(CPDFSDK_Document* pDocument,
                               CPDF_FormControl* pFormControl,
                               FX_BOOL bChangeMark,
                               FX_BOOL bResetAP,
                               FX_BOOL bRefresh) {
   ASSERT(pFormControl);
 
-  CPDFSDK_InterForm* pInterForm = (CPDFSDK_InterForm*)pDocument->GetInterForm();
-  CPDFSDK_Widget* pWidget = pInterForm->GetWidget(pFormControl);
+  CPDFSDK_InterForm* pForm = (CPDFSDK_InterForm*)pDocument->GetInterForm();
+  CPDFSDK_Widget* pWidget = pForm->GetWidget(pFormControl);
 
   if (pWidget) {
     if (bResetAP) {
       int nFieldType = pWidget->GetFieldType();
       if (nFieldType == FIELDTYPE_COMBOBOX ||
           nFieldType == FIELDTYPE_TEXTFIELD) {
         FX_BOOL bFormated = FALSE;
         CFX_WideString sValue = pWidget->OnFormat(bFormated);
         if (bFormated)
           pWidget->ResetAppearance(sValue.c_str(), FALSE);
@@ skipping 3283 matching lines @@
   }
 }
 
 void Field::AddField(CPDFSDK_Document* pDocument,
                      int nPageIndex,
                      int nFieldType,
                      const CFX_WideString& sName,
                      const CFX_FloatRect& rcCoords) {
   // Not supported.
 }