Remove use of "use_mirror" recipe property.

scripts/slave/recipe_modules/perf_dashboard/api.py

 # Copyright 2014 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 os
 import urllib
 
 from recipe_engine import recipe_api
 
 
 class PerfDashboardApi(recipe_api.RecipeApi):
   """Provides steps to take a list of perf points and post them to the
   Chromium Perf Dashboard.  Can also use the test url for testing purposes."""
 
   def get_skeleton_point(self, test, revision, value, bot=None):
@@ skipping 33 matching lines @@
         'masters': self.m.properties['mastername'],
         'bots': bot or self.m.properties['buildername'],
         'tests': test,
         'rev': revision,
     })
     presentation.links['Results Dashboard'] = ('%s/report?%s' %
                                                (self.c.url, params))
 
   def set_default_config(self):
     """If in golo, use real perf server, otherwise use testing perf server."""
-    if self.m.properties.get('use_mirror', True):  # We're on a bot
+    # TODO: This property should be passed explicitly supplied by the recipe
+    # scheduler, not inferred from arbitrary bot environment.
+    on_production_bot = self.m.properties.get('perf_production',
+        not any(v in os.environ for v in (
+          'TESTING_MASTERNAME',
+          'TESTING_SLAVENAME',
+        )))
+    if on_production_bot:  # We're on a bot
       self.set_config('production')
     else:
       self.set_config('testing')
 
   def post(self, data):
     """Takes a data object which can be jsonified and posts it to url."""
     self.m.python(name='perf dashboard post',
                   script=self.resource('post_json.py'),
                   stdin=self.m.json.input({
                       'url': '%s/add_point' % self.c.url,
@@ skipping 22 matching lines @@
         self.warning(response, reason)
 
   def halt(self, step_result, reason):  # pragma: no cover
     step_result.presentation.step_text = reason
     step_result.presentation.status = self.m.step.FAILURE
     raise self.m.step.StepFailure(reason)
 
   def warning(self, step_result, reason):  # pragma: no cover
     step_result.presentation.step_text = reason
     step_result.presentation.status = self.m.step.WARNING