Update from https://crrev.com/312398

mojo/edk/system/BUILD.gn

 # 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.
 
 import("../mojo_edk.gni")
+import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 config("system_config") {
   defines = [
     # Ensures that dependent projects import the core functions on Windows.
     "MOJO_USE_SYSTEM_IMPL",
@@ skipping 175 matching lines @@
   deps = [
     ":system",
     ":test_utils",
     "../test:test_support",
     "//base",
     "//base/test:test_support",
     "//base/test:test_support_perf",
     "//testing/gtest",
   ]
 }
-
-if (is_android) {
-  unittest_apk("mojo_system_unittests_apk") {
-    deps = [
-      ":mojo_system_unittests",
-    ]
-    unittests_dep = ":mojo_system_unittests"
-  }
-}