Kill NewTabPage.NumberOfMouseOvers.

chrome/browser/resources/local_ntp/most_visited_single.js

Index: chrome/browser/resources/local_ntp/most_visited_single.js
diff --git a/chrome/browser/resources/local_ntp/most_visited_single.js b/chrome/browser/resources/local_ntp/most_visited_single.js
index 9710464dd62e33dc5a55f8383597e1c14be01875..f3ce4d8c47fbed657888e74ab958c4b29fda1518 100644
--- a/chrome/browser/resources/local_ntp/most_visited_single.js
+++ b/chrome/browser/resources/local_ntp/most_visited_single.js
@@ -39,8 +39,6 @@ var LOG_TYPE = {
   NTP_GRAY_TILE_FALLBACK: 7,
   // The visuals of that tile's fallback are handled externally. Unused here.
   NTP_EXTERNAL_TILE_FALLBACK: 8,
-  // The user moused over an NTP tile.
-  NTP_MOUSEOVER: 9,

[Marc Treib, 2016/07/05 08:07:31]

Hm, there's a few other ones here that say "unused here". Could you remove the
others too, or comment them all out?

[sfiera, 2016/07/05 18:24:40]

Done.

   // A NTP Tile has finished loading (successfully or failing).
   NTP_TILE_LOADED: 10,
 };
@@ -467,10 +465,6 @@ var renderTile = function(data) {
       }
     }
   });
-  // TODO(fserb): remove this or at least change to mouseenter.
-  tile.addEventListener('mouseover', function() {
-    logEvent(LOG_TYPE.NTP_MOUSEOVER);
-  });
 
   var title = tile.querySelector('.mv-title');
   title.innerText = data.title;