[Telemetry refactor] Drop "2" from method calls to JS API

tools/perf/page_sets/login_helpers/dropbox_login.py

 # Copyright 2016 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 page_sets.login_helpers import login_utils
 
 
 def LoginAccount(action_runner, credential,
                  credentials_path=login_utils.DEFAULT_CREDENTIAL_PATH):
   """Logs in into a Dropbox account.
@@ skipping 14 matching lines @@
       credential, credentials_path=credentials_path)
 
   action_runner.Navigate('https://www.dropbox.com/login')
   login_utils.InputWithSelector(
       action_runner, account_name, 'input[name=login_email]')
   login_utils.InputWithSelector(
       action_runner, password, 'input[name=login_password]')
 
   # Wait until the "Sign in" button is enabled and then click it.
   login_button_selector = '.login-form .login-button'
-  action_runner.WaitForJavaScriptCondition2('''
+  action_runner.WaitForJavaScriptCondition('''
       (function() {
         var loginButton = document.querySelector({{ selector }});
         if (!loginButton)
           return false;
         return !loginButton.disabled;
       })();''',
       selector=login_button_selector)
   action_runner.ClickElement(selector=login_button_selector)
   action_runner.WaitForNavigate()