Re-enable MSVC warning 4800 for compiling with chromium_code

core/include/fxcrt/fx_system.h

Index: core/include/fxcrt/fx_system.h
diff --git a/core/include/fxcrt/fx_system.h b/core/include/fxcrt/fx_system.h
index 76c413e7e31aa614ae8c46c44d9d43e5afbac411..f62e126fbb8d6d68e88971b34361536de7f17e7d 100644
--- a/core/include/fxcrt/fx_system.h
+++ b/core/include/fxcrt/fx_system.h
@@ -258,10 +258,12 @@ wchar_t* FXSYS_wcsupr(wchar_t* str);
 #define FXDWORD_FROM_MSBFIRST(i)                        \
   (((uint8_t)(i) << 24) | ((uint8_t)((i) >> 8) << 16) | \
    ((uint8_t)((i) >> 16) << 8) | (uint8_t)((i) >> 24))
-#define FXDWORD_GET_LSBFIRST(p) \
-  ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | (p[0]))
-#define FXDWORD_GET_MSBFIRST(p) \
-  ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]))
+#define FXDWORD_GET_LSBFIRST(p)                                                \
+  ((static_cast<FX_DWORD>(p[3]) << 24) | (static_cast<FX_DWORD>(p[2]) << 16) | \
+   (static_cast<FX_DWORD>(p[1]) << 8) | (static_cast<FX_DWORD>(p[0])))
+#define FXDWORD_GET_MSBFIRST(p)                                                \
+  ((static_cast<FX_DWORD>(p[0]) << 24) | (static_cast<FX_DWORD>(p[1]) << 16) | \
+   (static_cast<FX_DWORD>(p[2]) << 8) | (static_cast<FX_DWORD>(p[3])))
 #define FXSYS_HIBYTE(word) ((uint8_t)((word) >> 8))
 #define FXSYS_LOBYTE(word) ((uint8_t)(word))
 #define FXSYS_HIWORD(dword) ((FX_WORD)((dword) >> 16))