Re-enable MSVC warning 4800 for compiling with chromium_code

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>
@@ skipping 3004 matching lines @@
 
   if (!m_bCanSet)
     return FALSE;
 
   int iSize = params.size();
   if (iSize < 1)
     return FALSE;
 
   int nWidget = params[0].ToInt();
 
-  FX_BOOL bCheckit = TRUE;
+  bool bCheckit = true;
   if (iSize >= 2)
     bCheckit = params[1].ToBool();
 
   std::vector<CPDF_FormField*> FieldArray = GetFormFields(m_FieldName);
   if (FieldArray.empty())
     return FALSE;
 
   CPDF_FormField* pFormField = FieldArray[0];
   if (pFormField->GetFieldType() != FIELDTYPE_CHECKBOX &&
       pFormField->GetFieldType() != FIELDTYPE_RADIOBUTTON)
     return FALSE;
   if (nWidget < 0 || nWidget >= pFormField->CountControls())
     return FALSE;
+  // TODO(weili): Check whether anything special needed for radio button,
+  // otherwise merge these branches.
   if (pFormField->GetFieldType() == FIELDTYPE_RADIOBUTTON)
-    pFormField->CheckControl(nWidget, bCheckit, TRUE);
+    pFormField->CheckControl(nWidget, bCheckit, true);
   else
-    pFormField->CheckControl(nWidget, bCheckit, TRUE);
+    pFormField->CheckControl(nWidget, bCheckit, true);
 
   UpdateFormField(m_pDocument, pFormField, TRUE, TRUE, TRUE);
   return TRUE;
 }
 
 FX_BOOL Field::clearItems(IJS_Context* cc,
                           const std::vector<CJS_Value>& params,
                           CJS_Value& vRet,
                           CFX_WideString& sError) {
   return TRUE;
@@ skipping 536 matching lines @@
   }
 }
 
 void Field::AddField(CPDFSDK_Document* pDocument,
                      int nPageIndex,
                      int nFieldType,
                      const CFX_WideString& sName,
                      const CFX_FloatRect& rcCoords) {
   // Not supported.
 }