Re-enable MSVC warning 4800 for compiling with chromium_code

core/include/fxcrt/fx_ext.h

Index: core/include/fxcrt/fx_ext.h
diff --git a/core/include/fxcrt/fx_ext.h b/core/include/fxcrt/fx_ext.h
index 689d8e8fc4bd185d6cab5f5672ebe4d9107503db..dda6a5c72b458312c194f1cc55a4dfcb131f06d3 100644
--- a/core/include/fxcrt/fx_ext.h
+++ b/core/include/fxcrt/fx_ext.h
@@ -60,23 +60,19 @@ inline int FXSYS_toHexDigit(const FX_CHAR c) {
 }
 
 inline bool FXSYS_isDecimalDigit(const FX_CHAR c) {
-  return std::isdigit(c);
+  return !!std::isdigit(c);
 }
 
 inline bool FXSYS_isDecimalDigit(const FX_WCHAR c) {
-  return std::iswdigit(c);
+  return !!std::iswdigit(c);
 }
 
 inline int FXSYS_toDecimalDigit(const FX_CHAR c) {
-  if (!std::isdigit(c))
-    return 0;
-  return c - '0';
+  return std::isdigit(c) ? c - '0' : 0;
 }
 
 inline int FXSYS_toDecimalDigit(const FX_WCHAR c) {
-  if (!std::iswdigit(c))
-    return 0;
-  return c - L'0';
+  return std::iswdigit(c) ? c - L'0' : 0;
 }
 
 FX_DWORD FX_HashCode_String_GetA(const FX_CHAR* pStr,