Cleanup interaction creation and add ExecuteJavaScript to action_runner.py

tools/perf/page_sets/top_25.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.
 # pylint: disable=W0401,W0614
 from telemetry.page.actions.all_page_actions import *
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class Top25Page(page_module.Page):
@@ skipping 187 matching lines @@
     action_runner.NavigateToPage(self)
     action_runner.RunAction(WaitAction(
       {
         'seconds': 2
       }))
     action_runner.RunAction(WaitAction(
       {
         'condition': 'element',
         'selector': 'div[class~="navForward"]'
       }))
-    action_runner.RunAction(JavascriptAction(
-      {
-        'expression': '''
-          (function() {
-            var elem = document.createElement('meta');
-            elem.name='viewport';
-            elem.content='initial-scale=1';
-            document.body.appendChild(elem);
-          })();'''
-      }))
+    action_runner.ExecuteJavaScript('''
+        (function() {
+          var elem = document.createElement('meta');
+          elem.name='viewport';
+          elem.content='initial-scale=1';
+          document.body.appendChild(elem);
+        })();''')
     action_runner.RunAction(WaitAction(
       {
         'seconds': 1
       }))
 
   def RunStressMemory(self, action_runner):
     action_runner.RunAction(ClickElementAction(
       {
         'selector': 'div[class~="navForward"]'
       }))
@@ skipping 593 matching lines @@
       # Why: #1 Alexa reference
       'http://answers.yahoo.com',
       # Why: #1 Alexa sports
       'http://sports.yahoo.com/',
       # Why: top tech blog
       'http://techcrunch.com'
     ]
 
     for url in other_urls:
       self.AddPage(Top25Page(url, self))