Issue #21 - Remove use counters telemetry

This reverts Bug 968923 - Implement some equivalent of Chrome's use counters (on top of telemetry?)

For reference: https://bugzilla.mozilla.org/show_bug.cgi?id=968923

dom/base/test/file_use_counter_svg_getElementById.svg

@@ -1,22 +0,0 @@
-<?xml version="1.0" standalone="no"?>
-
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
-  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg width="4in" height="3in" version="1.1"
-     xmlns="http://www.w3.org/2000/svg"
-     xmlns:xlink="http://www.w3.org/1999/xlink">
-  <desc>Test graphic for hitting getElementById
-  </desc>
-  <image id="i1" x="200" y="200" width="100px" height="80px">
-  </image>
-  <circle cx="100" cy="50" r="40" stroke="black" stroke-width="2" fill="red"/>
-  <script type="text/javascript"> <![CDATA[
-    var image = document.documentElement.getElementById("i1");
-    image.addEventListener("load",
-                           function() {
-                            document.documentElement.removeAttribute("class");
-                           },
-                           false);
-    ]]>
-  </script>
-</svg>