values were not endian dependent (crash)

gfx/2d/Types.h

@@ -61,15 +61,8 @@ enum class SurfaceFormat : int8_t {
   // The following values are endian-independent synonyms. The _UINT32 suffix
   // indicates that the name reflects the layout when viewed as a uint32_t
   // value.
-#if MOZ_BIG_ENDIAN
   A8R8G8B8_UINT32 = B8G8R8A8,       // 0xAARRGGBB
   X8R8G8B8_UINT32 = B8G8R8X8        // 0x00RRGGBB
-#elif MOZ_LITTLE_ENDIAN
-  A8R8G8B8_UINT32 = A8R8G8B8,       // 0xAARRGGBB
-  X8R8G8B8_UINT32 = X8R8G8B8        // 0x00RRGGBB
-#else
-# error "bad endianness"
-#endif
 };
 
 inline bool IsOpaque(SurfaceFormat aFormat)