Convert isolate.py to exclusively use .isolate files.

tools/isolate/trace_inputs_smoke_test.py

 #!/usr/bin/env python
 # 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.
 
 import cStringIO
 import logging
 import os
 import shutil
 import subprocess
@@ skipping 84 matching lines @@
     # TODO(maruel): Make sure there is no Unexpected part, even in the case of
     # virtualenv usage.
     self.assertEquals(expected_end, actual[-len(expected_end):])
 
   def test_trace_gyp(self):
     import trace_inputs
     expected_value = {
       'conditions': [
         ['OS=="%s"' % trace_inputs.get_flavor(), {
           'variables': {
-            'isolate_files': [
+            'isolate_dependency_tracked': [
               '<(DEPTH)/trace_inputs.py',
               '<(DEPTH)/%s' % FILENAME,
             ],
-            'isolate_dirs': [
+            'isolate_dependency_untracked': [
               'trace_inputs/',
             ],
           },
         }],
       ],
     }
     expected_buffer = cStringIO.StringIO()
     trace_inputs.pretty_print(expected_value, expected_buffer)
 
     actual = self._execute(True)
@@ skipping 38 matching lines @@
   if sys.argv[1] == '--child':
     return child()
   if sys.argv[1] == '--child-gyp':
     return child_gyp()
 
   unittest.main()
 
 
 if __name__ == '__main__':
   sys.exit(main())