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

webrtc/modules/audio_device/audio_device_tests.isolate

Index: webrtc/modules/audio_device/audio_device_tests.isolate
diff --git a/webrtc/modules/audio_device/audio_device_tests.isolate b/webrtc/modules/audio_device/audio_device_tests.isolate
deleted file mode 100644
index f5a0c184447f2d3ce7b7058ea78a3baf7c6c7f4a..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_device/audio_device_tests.isolate
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (c) 2013 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.
-{
-  'conditions': [
-    ['OS=="linux" or OS=="mac" or OS=="win"', {
-      'variables': {
-        'command': [
-          '<(DEPTH)/testing/test_env.py',
-          '<(PRODUCT_DIR)/audio_device_tests<(EXECUTABLE_SUFFIX)',
-        ],
-        'files': [
-          '<(DEPTH)/testing/test_env.py',
-          '<(PRODUCT_DIR)/audio_device_tests<(EXECUTABLE_SUFFIX)',
-        ],
-      },
-    }],
-  ],
-}