remove -DSK_SUPPORT_LEGACY_A8_MASKBLITTER
remove -DSK_SUPPORT_LEGACY_A8_MASKBLITTER

Test: atest CtsGraphicsTestCases:android.graphics.drawable.cts.VectorDrawableTest
Change-Id: I2296e2a0f00b780de4ab03321b43aa100d9e9c9f

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia