Re-enable MSVC warning 4800 for compiling with chromium_code

core/include/fxcrt/fx_ext.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_FXCRT_FX_EXT_H_
 #define CORE_INCLUDE_FXCRT_FX_EXT_H_
 
 #include <cctype>
@@ skipping 42 matching lines @@
 }
 
 inline int FXSYS_toHexDigit(const FX_CHAR c) {
   if (!std::isxdigit(c))
     return 0;
   char upchar = std::toupper(c);
   return upchar > '9' ? upchar - 'A' + 10 : upchar - '0';
 }
 
 inline bool FXSYS_isDecimalDigit(const FX_CHAR c) {
-  return std::isdigit(c);
+  return std::isdigit(c) != 0;

[Tom Sepez, 2016/03/11 00:30:28]

nit: prefer !!std::isdigit(c) 
also below.

[Wei Li, 2016/03/11 04:11:36]

Done.

 }
 
 inline bool FXSYS_isDecimalDigit(const FX_WCHAR c) {
-  return std::iswdigit(c);
+  return std::iswdigit(c) != 0;
 }
 
 inline int FXSYS_toDecimalDigit(const FX_CHAR c) {
   if (!std::isdigit(c))

[Tom Sepez, 2016/03/11 00:30:28]

nit: as long as we're here, how about
return std::isdigit(c) ? c - '0' : 0;

[Wei Li, 2016/03/11 04:11:36]

Done.

     return 0;
   return c - '0';
 }
 
 inline int FXSYS_toDecimalDigit(const FX_WCHAR c) {
   if (!std::iswdigit(c))
     return 0;
   return c - L'0';
 }
 
@@ skipping 47 matching lines @@
           j -= gap;
         }
         pArray[j + gap] = v1;
       }
       gap >>= 1;
     }
   }
 };
 
 #endif  // CORE_INCLUDE_FXCRT_FX_EXT_H_