Temporarily use default webp encode method for bzl

I suspect that this will fix the failing golden image tests.

Bug: skia:
Change-Id: I9f88206ae782e6a04817e72cdfcb3e0c4bdaa293
Reviewed-on: https://skia-review.googlesource.com/17393
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/public.bzl b/public.bzl
index 1813af0..ba3b3b0 100644
--- a/public.bzl
+++ b/public.bzl
@@ -659,6 +659,8 @@
     # Turn on a few Google3-specific build fixes.
     "GOOGLE3",
     # Staging flags for API changes
+    # Should remove after we update golden images
+    "SK_WEBP_ENCODER_USE_DEFAULT_METHOD",
     # Temporarily Disable analytic AA for Google3
     "SK_NO_ANALYTIC_AA",
 ]