Revert of Convert ppapi_unittests to run exclusively on Swarming

ppapi/ppapi_tests.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       # GN version: //ppapi:ppapi_tests
       'target_name': 'ppapi_tests',
       'type': 'loadable_module',
@@ skipping 635 matching lines @@
       ],
       'sources': [
         'examples/compositor/compositor.cc',
         'examples/compositor/spinning_cube.cc',
         'examples/compositor/spinning_cube.h',
       ],
     },
     # Adding a new PPAPI example? Don't forget to update the GN build.
     # See //ppapi/examples/BUILD.gn
   ],
-  'conditions': [
-    ['test_isolation_mode != "noop"', {
-      'targets': [
-        {
-          'target_name': 'ppapi_unittests_run',
-          'type': 'none',
-          'dependencies': [
-            'ppapi_unittests',
-          ],
-          'includes': [ '../build/isolate.gypi' ],
-          'sources': [ 'ppapi_unittests.isolate' ],
-        },
-      ],
-    }],
-  ],
 }