Fix errors when running against staging

tools/chrome_proxy/webdriver/bypass.py

 # Copyright 2017 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 common
 from common import TestDriver
 from common import IntegrationTest
 
 
 class Bypass(IntegrationTest):
@@ skipping 119 matching lines @@
       # MissingViaHeader4xx category (which is enum value 4), to make sure that
       # the bypass was caused by the missing via header logic and not something
       # else.
       histogram = test_driver.GetHistogram(
           "DataReductionProxy.BlockTypePrimary")
       self.assertEqual(1, histogram['count'])
       self.assertIn({'count': 1, 'high': 5, 'low': 4}, histogram['buckets'])
 
   # Verify that the Data Reduction Proxy understands the "exp" directive.
   def testExpDirectiveBypass(self):
+    # If it was attempted to run with another experiment, skip this test.
+    if common.ParseFlags().browser_args and ('--data-reduction-proxy-experiment'
+        in common.ParseFlags().browser_args):
+      self.skipTest('This test cannot be run with other experiments.')
     with TestDriver() as test_driver:
       test_driver.AddChromeArg('--enable-spdy-proxy-auth')
       test_driver.AddChromeArg('--data-reduction-proxy-experiment=test')
 
       # Verify that loading a page other than the specific exp directive test
       # page loads through the proxy without being bypassed.
       test_driver.LoadURL('http://check.googlezip.net/test.html')
       responses = test_driver.GetHTTPResponses()
       self.assertNotEqual(0, len(responses))
       for response in responses:
@@ skipping 14 matching lines @@
 
       test_driver.LoadURL('http://check.googlezip.net/exp/')
       responses = test_driver.GetHTTPResponses()
       self.assertNotEqual(0, len(responses))
       for response in responses:
         self.assertHasChromeProxyViaHeader(response)
 
 
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()