stop using SK_USE_FLOATBITS

Bug: skia:
Change-Id: Ie225e0b082b49a2978818c243a2c344a4761b297
Reviewed-on: https://skia-review.googlesource.com/31141
Reviewed-by: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index 864945a..b967b0e 100644
--- a/public.bzl
+++ b/public.bzl
@@ -659,7 +659,6 @@
 
 DEFINES_ALL = [
     # Chrome DEFINES.
-    "SK_USE_FLOATBITS",
     "SK_USE_FREETYPE_EMBOLDEN",
     # Turn on a few Google3-specific build fixes.
     "GOOGLE3",