Telemetry: Clean up tap and click_element gestures.

tools/perf/page_sets/key_mobile_sites.json

 {
   "description": "Key mobile sites",
   "archive_data_file": "data/key_mobile_sites.json",
   "credentials_path": "data/credentials.json",
   "user_agent_type": "mobile",
   "smoothness": { "action": "scroll" },
   "pages": [
     {
       "url": "http://www.androidpolice.com/2012/10/03/rumor-evidence-mounts-that-an-lg-optimus-g-nexus-is-coming-along-with-a-nexus-phone-certification-program/",
       "why": "crbug.com/242544"
@@ skipping 134 matching lines @@
     {
       "url": "http://www.booking.com/searchresults.html?src=searchresults&latitude=65.0500&longitude=25.4667",
       "why": "#1 Alexa recreation"
     },
     {
       "url": "http://answers.yahoo.com/question/index?qid=20110117024343AAopj8f",
       "why": "#1 Alexa reference",
       "navigate_steps": [
         { "action": "navigate" },
         { "action": "wait", "condition": "element", "text": "Other Answers (1 - 20 of 149)" },
-        { "action": "click_element", "text": "Other Answers (1 - 20 of 149)" }
+        { "action": "javascript_click", "text": "Other Answers (1 - 20 of 149)" }
       ]
     },
     {
       "url": "http://sports.yahoo.com/",
       "why": "#1 Alexa sports"
     },
     {
       "url": "http://techcrunch.com",
       "why": "Top tech blog"
     },
@@ skipping 115 matching lines @@
       ],
       "smoothness": {
         "action": "scroll",
         "scroll_requires_touch": true,
         "scrollable_element_function": "function(callback) { callback(document.getElementById(':5')); }",
         "remaining_scroll_distance_function": "function() { return Math.max(0, 2500 + document.getElementById(':h').getBoundingClientRect().top); }"
       }
     }
   ]
 }