Convert isolate.py to exclusively use .isolate files.

third_party/cacheinvalidation/cacheinvalidation_unittests.isolate

Index: third_party/cacheinvalidation/cacheinvalidation_unittests.isolate
diff --git a/third_party/cacheinvalidation/cacheinvalidation_unittests.isolate b/third_party/cacheinvalidation/cacheinvalidation_unittests.isolate
new file mode 100644
index 0000000000000000000000000000000000000000..c9b7034d3485adc72c251dd21faae03907ed7808
--- /dev/null
+++ b/third_party/cacheinvalidation/cacheinvalidation_unittests.isolate
@@ -0,0 +1,13 @@
+# 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': [
+      '<(PRODUCT_DIR)/cacheinvalidation_unittests<(EXECUTABLE_SUFFIX)',
+    ],
+    'isolate_dependency_tracked': [
+      '<(PRODUCT_DIR)/cacheinvalidation_unittests<(EXECUTABLE_SUFFIX)',
+    ],
+  },
+}