remove legacy flags from google3

Bug: skia:6481,skia:6513
Change-Id: I3aac61df1252c16d1b7b8b4d78955da9accc464e
Reviewed-on: https://skia-review.googlesource.com/13777
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index 1b5df54..01d70f7 100644
--- a/public.bzl
+++ b/public.bzl
@@ -656,8 +656,6 @@
     # Staging flags for API changes
     # Temporarily Disable analytic AA for Google3
     "SK_NO_ANALYTIC_AA",
-    "SK_SUPPORT_LEGACY_CANVAS_READPIXELS",
-    "SK_SUPPORT_OBSOLETE_LOCKPIXELS",
 ]
 
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