fix ipc_mojo_unittests.isolate dependencies

ipc/mojo/ipc_mojo_unittests.isolate

 # Copyright 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.
 {
   'includes': [
-    '../../mojo/mojo.isolate',
+    '../../base/base.isolate',
   ],
   'conditions': [
     ['OS=="win" or OS=="mac" or OS=="linux"', {
       'variables': {
         'command': [
           '../../testing/test_env.py',
           '<(PRODUCT_DIR)/ipc_mojo_unittests<(EXECUTABLE_SUFFIX)',
           '--brave-new-test-launcher',
           '--test-launcher-bot-mode',
         ],
         'files': [
           '../../testing/test_env.py',
         ],
       },
     }],
   ],
 }