gypi -> gni: core, effects, android framework defines

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4023

Change-Id: I29a26c1716a319156a34a64999756ed7dba1e603
Reviewed-on: https://skia-review.googlesource.com/4023
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index ab9d90c..30f58fe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -3,6 +3,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("gn/android_framework_defines.gni")
 import("gn/shared_sources.gni")
 
 if (!defined(is_skia_standalone)) {
@@ -66,7 +67,7 @@
     defines += [ "SK_SAMPLES_FOR_X" ]
   }
   if (skia_enable_android_framework_defines) {
-    defines += skia_android_framework_defines
+    defines += android_framework_defines
   }
   if (!skia_enable_gpu) {
     defines += [ "SK_SUPPORT_GPU=0" ]