gn_migration.gypi: Do not pull aura_unittests_run unless use_aura==1.

build/gn_migration.gypi

 # Copyright (c) 2015 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.
 
 # This file defines five targets that we are using to track the progress of the
 # GYP->GN migration:
 #
 # 'both_gn_and_gyp' lists what GN is currently capable of building and should
 # match the 'both_gn_and_gyp' target in //BUILD.gn.
 #
@@ skipping 522 matching lines @@
             '../gpu/gpu.gyp:gpu_unittests_run',
             '../ipc/ipc.gyp:ipc_tests_run',
             '../media/cast/cast.gyp:cast_unittests_run',
             '../media/media.gyp:media_unittests_run',
             '../media/midi/midi.gyp:midi_unittests_run',
             '../net/net.gyp:net_unittests_run',
             '../sql/sql.gyp:sql_unittests_run',
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests_run',
             '../ui/accessibility/accessibility.gyp:accessibility_unittests_run',
             '../ui/app_list/app_list.gyp:app_list_unittests_run',
-            '../ui/aura/aura.gyp:aura_unittests_run',
             '../ui/events/events.gyp:events_unittests_run',
             '../ui/message_center/message_center.gyp:message_center_unittests_run',
             '../ui/touch_selection/ui_touch_selection.gyp:ui_touch_selection_unittests_run',
           ],
+          'conditions': [
+            ['use_aura==1', {
+              'dependencies': [
+                '../ui/aura/aura.gyp:aura_unittests_run',
+              ],
+            }],
+          ],
         }],
         ['test_isolation_mode!="noop" and use_ash==1', {
           'dependencies': [
             '../ash/ash.gyp:ash_unittests_run',
           ],
         }],
         ['test_isolation_mode!="noop" and OS=="linux"', {
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox_linux_unittests_run',
           ],
@@ skipping 116 matching lines @@
           'dependencies': [
             # TODO(GYP): All of these targets need to be ported over.
             '../components/components.gyp:policy_win64',
           ]
         }],
       ],
     },
   ]
 }