Convert isolate.py to exclusively use .isolate files.

tools/isolate/data/isolate/fail.isolate

Index: tools/isolate/data/isolate/fail.isolate
diff --git a/tools/isolate/data/isolate/fail.isolate b/tools/isolate/data/isolate/fail.isolate
new file mode 100644
index 0000000000000000000000000000000000000000..9d2744d3dcf4d1eb4a2230c4c44af5ed570f21f0
--- /dev/null
+++ b/tools/isolate/data/isolate/fail.isolate
@@ -0,0 +1,18 @@
+# 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',
+      '--fail',
+    ],
+    'isolate_dependency_tracked': [
+      '<(DEPTH)/data/isolate/child.py',
+    ],
+    'isolate_dependency_untracked': [
+      'files1/',
+    ],
+  },
+}