[tools] Explicit timeout keyword in WaitForJavaScriptCondition

tools/chrome_proxy/integration_tests/chrome_proxy_pagesets/block_once.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.
 
 from common.chrome_proxy_shared_page_state import ChromeProxySharedPageState
 from telemetry.page import page as page_module
 from telemetry import story
 
 
 class BlockOncePage(page_module.Page):
@@ skipping 18 matching lines @@
           window.post_request_completed = true;
           var viaProxyRequest = new XMLHttpRequest();
           viaProxyRequest.open("GET",
               "http://check.googlezip.net/image.png");
           viaProxyRequest.send();
         };
         request.send();
       })();
     ''')
     action_runner.WaitForJavaScriptCondition(
-        "window.post_request_completed == true", 30)
+        "window.post_request_completed == true", timeout_in_seconds=30)
 
 class BlockOnceStorySet(story.StorySet):
 
   """ Chrome proxy test sites """
 
   def __init__(self):
     super(BlockOnceStorySet, self).__init__()
 
     # Test block-once for a GET request.
     urls_list = [
       'http://check.googlezip.net/blocksingle/',
     ]
 
     for url in urls_list:
       self.AddStory(BlockOncePage(url, self))