Rewrite isolate_smoke_test.py to increase the coverage.

tools/isolate/data/isolate/ok.isolate

Index: tools/isolate/data/isolate/ok.isolate
diff --git a/tools/isolate/data/isolate/ok.isolate b/tools/isolate/data/isolate/ok.isolate
deleted file mode 100644
index db2f42352944a4a5f51a8a07bd39f8c320eb6345..0000000000000000000000000000000000000000
--- a/tools/isolate/data/isolate/ok.isolate
+++ /dev/null
@@ -1,18 +0,0 @@
-# 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.
-{
-  'variables': {
-    'command': [
-      'python',
-      'child.py',
-      '--ok',
-    ],
-    'isolate_dependency_tracked': [
-      '<(DEPTH)/data/isolate/child.py',
-    ],
-    'isolate_dependency_untracked': [
-      'files1/',
-    ],
-  },
-}