Cleanup desktop NTP metrics recording

chrome/browser/resources/local_ntp/most_visited_single.js

 /* Copyright 2015 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. */
 
  // Single iframe for NTP tiles.
 (function() {
 'use strict';
 
 
 /**
  * The different types of events that are logged from the NTP.  This enum is
  * used to transfer information from the NTP JavaScript to the renderer and is
  * not used as a UMA enum histogram's logged value.
  * Note: Keep in sync with common/ntp_logging_events.h
  * @enum {number}
  * @const
  */
 var LOG_TYPE = {
-  // The suggestion is coming from the server.
+  // A suggestion coming from the server was rendered.
   NTP_SERVER_SIDE_SUGGESTION: 0,
-  // The suggestion is coming from the client.
+  // A suggestion coming from the client was rendered.
   NTP_CLIENT_SIDE_SUGGESTION: 1,
-  // Indicates a tile was rendered, no matter if it's a thumbnail, a gray tile
-  // or an external tile.
-  NTP_TILE: 2,
   // All NTP Tiles have finished loading (successfully or failing).
   NTP_ALL_TILES_LOADED: 11,
 };
 
 
 /**
  * The different sources that an NTP tile can have.
  * Note: Keep in sync with common/ntp_logging_events.h
  * @enum {number}
  * @const
@@ skipping 328 matching lines @@
  *     data is null if you want to construct an empty tile.
  */
 var renderTile = function(data) {
   var tile = document.createElement('a');
 
   if (data == null) {
     tile.className = 'mv-empty-tile';
     return tile;
   }
 
-  logEvent(LOG_TYPE.NTP_TILE);
   // The tile will be appended to tiles.
   var position = tiles.children.length;
   logMostVisitedImpression(position, data.tileSource);
 
   tile.className = 'mv-tile';
   tile.setAttribute('data-tid', data.tid);
   var html = [];
   if (!USE_ICONS) {
     html.push('<div class="mv-favicon"></div>');
   }
@@ skipping 230 matching lines @@
     var html = document.querySelector('html');
     html.dir = 'rtl';
   }
 
   window.addEventListener('message', handlePostMessage);
 };
 
 
 window.addEventListener('DOMContentLoaded', init);
 })();