Revert of For Google3, enable SK_SUPPORT_LEGACY_SAVEFLAGS; required by legacy webkit_headless. (patchset #2 id:20001 of https://codereview.chromium.org/1568633002/ )

Reason for revert:
Removed legacy saveflags in internal cl/111889802.

Original issue's description:
> For Google3, enable SK_SUPPORT_LEGACY_SAVEFLAGS; required by legacy webkit_headless.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1568633002
>
> Committed: https://skia.googlesource.com/skia/+/85c8d06540942531fe3440fafa2a2825f128251a

TBR=mtklein@google.com,reed@google.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=skia:

Review URL: https://codereview.chromium.org/1578033003
diff --git a/BUILD.public b/BUILD.public
index 68af4d9..5816acd 100644
--- a/BUILD.public
+++ b/BUILD.public
@@ -414,9 +414,6 @@
     # Chrome DEFINES.
     "SK_USE_FLOATBITS",
     "SK_USE_FREETYPE_EMBOLDEN",
-    # TODO(benjaminwagner): Needed for internal cl/107719535, but will be fixed
-    # up after that CL is submitted.
-    "SK_SUPPORT_LEGACY_SAVEFLAGS",
     # Turn on a few Google3-specific build fixes.
     "GOOGLE3",
 ]