Revert of [swarming] Isolate v8 testing.

test/default.isolate

Index: test/default.isolate
diff --git a/test/default.isolate b/test/default.isolate
deleted file mode 100644
index d3d0c1430e982937ed43ae37fe4a02f08aeb017b..0000000000000000000000000000000000000000
--- a/test/default.isolate
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright 2015 the V8 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.
-{
-  'includes': [
-    'cctest/cctest.isolate',
-    'intl/intl.isolate',
-    'message/message.isolate',
-    'mjsunit/mjsunit.isolate',
-    'preparser/preparser.isolate',
-  ],
-}