Update isolate.gypi to support Swarming + move .isolate files

webrtc/modules/audio_coding/audio_coding_tests.gypi

 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'includes': [
@@ skipping 33 matching lines @@
       'targets': [
         {
           'target_name': 'audio_codec_speed_tests_apk_target',
           'type': 'none',
           'dependencies': [
             '<(apk_tests_path):audio_codec_speed_tests_apk',
           ],
         },
       ],
     }],
-    ['test_isolation_mode != "noop"', {
-      'targets': [
-        {
-          'target_name': 'audio_codec_speed_tests_run',
-          'type': 'none',
-          'dependencies': [
-            'audio_codec_speed_tests',
-          ],
-          'includes': [
-            '../../build/isolate.gypi',
-          ],
-          'sources': [
-            'audio_codec_speed_tests.isolate',
-          ],
-        },
-      ],
-    }],
   ],
 }