Remove SK_SUPPORT_LEGACY_DATA_FACTORIES.

skia/chromium_skia_defines.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables': {
 
     # This is a place for defines which will hold out Skia changes.
     #
     # When Skia needs to make a change which will affect Chromium, a define may
     # be added here, the Skia change made behind this define, then Skia rolled
     # into Chromium. At this point the Chromium side change can be made while
     # also removing the define. After this Skia can remove the code behind the
     # now no longer needed define.
     #
     # Examples of these sorts of changes are Skia API changes and Skia changes
     # which will affect blink baselines.
     #
     # The intent is that the defines here are transient. Every effort should be
     # made to remove these defines as soon as practical. This is in contrast to
     # defines in SkUserConfig.h which are normally more permanent.
     'chromium_skia_defines': [
       'SK_IGNORE_DW_GRAY_FIX',
-      'SK_SUPPORT_LEGACY_DATA_FACTORIES',
     ],
   },
 }