Merge backout of Bug 572034.

gfx/ycbcr/Makefile.in

@@ -30,13 +30,8 @@ CPPSRCS += yuv_row_linux.cpp \
            $(NULL)
 else
 ifeq ($(OS_ARCH),Darwin)
-ifeq ($(OS_TEST),x86_64)
-CPPSRCS += yuv_row_linux.cpp \
-           $(NULL)
-else
 CPPSRCS += yuv_row_mac.cpp \
            $(NULL)
-endif
 else
 CPPSRCS += yuv_row_other.cpp \
            $(NULL)