Fix errors when running against staging

tools/chrome_proxy/webdriver/lite_page.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 LitePage(IntegrationTest):
 
   # Checks that a Lite Page is served and that the ignore_preview_blacklist
   # experiment is being used.
   def testLitePage(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-lo-fi=always-on')
       test_driver.AddChromeArg('--enable-data-reduction-proxy-lite-page')
 
       test_driver.LoadURL('http://check.googlezip.net/test.html')
 
       lite_page_responses = 0
       for response in test_driver.GetHTTPResponses():
         # Skip CSI requests when validating Lite Page headers. CSI requests
@@ skipping 81 matching lines @@
           continue
 
         self.checkLoFiResponse(response, False)
 
       # Verify that a Lite Page was requested and that the page fell back to
       # Lo-Fi images.
       self.assertEqual(1, lite_page_requests)
 
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()