remove unneeded flags

BUG=skia:

Change-Id: If114167e6ea9aaf3d90878ee62361743853e3b44
Reviewed-on: https://skia-review.googlesource.com/8473
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index 6d494f6..839bf66 100644
--- a/public.bzl
+++ b/public.bzl
@@ -599,8 +599,6 @@
     "SK_NO_ANALYTIC_AA",
     "SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF",
     "SK_SUPPORT_LEGACY_CLIPOP_EXOTIC_NAMES",
-    "SK_SUPPORT_LEGACY_SCALARMUL",
-    "SK_SUPPORT_BARE_PTR_IMAGEGENERATOR",
 ]
 
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