Revert "Implement consoleRedirect: true"

This reverts commit 64ca79d. It turns out that this wasn't really
necessary after all, as Karma is supposed to redirect this by itself. I
was however somewhat deceived by it not redirecting console.log. This
was a unintentional breaking change of karma-1.5.0 [1].

The workaround for the issue of missing log statements is to override
the default `level` of `browserConsoleLogOptions`, as shown below.

  // karma.conf.js
  module.exports = function(config) {
    config.set({
      browsers: ['jsdom'],

      browserConsoleLogOptions: {
        level: 'log'
      }
    });
  };

[1] karma-runner/karma#2582

index.js

@@ -16,13 +16,7 @@ var jsdomBrowser = function (baseBrowserDecorator, config) {
   this.name = "jsdom";
 
   this._start = function (url) {
-    var virtualConsole = null;
-
     if (jsdom.JSDOM) { // Indicate jsdom >= 10.0.0 and a new API
-      if (config.redirectConsole) {
-        virtualConsole = new jsdom.VirtualConsole().sendTo(console);
-      }
-
       var jsdomOptions = {
         resources: "usable",
         runScripts: "dangerously",
@@ -35,13 +29,8 @@ var jsdomBrowser = function (baseBrowserDecorator, config) {
 
       jsdom.JSDOM.fromURL(url, jsdomOptions);
     } else {
-      if (config.redirectConsole) {
-        virtualConsole = jsdom.createVirtualConsole().sendTo(console);
-      }
-
       var jsdomOptions = {
         url: url,
-        virtualConsole: virtualConsole,
         features : {
           FetchExternalResources: ["script", "iframe"],
           ProcessExternalResources: ["script"]

test/test-helper/index.js

@@ -8,8 +8,6 @@ let { randomBytes } = require("crypto");
 
 let { exec, spawn } = require("./child_process");
 
-let { Writable } = require("stream");
-
 function generateRandomFilePath () {
   return join(
     tmpdir(),
@@ -57,26 +55,7 @@ function waitToExit (process) {
   });
 }
 
-class WriteableBuffer extends Writable {
-  constructor (options) {
-    super(options);
-
-    this.chunks = [];
-  }
-
-  _write (chunk, encoding, callback) {
-    this.chunks.push(chunk);
-
-    callback();
-  }
-
-  getContents () {
-    return Buffer.concat(this.chunks);
-  }
-}
-
 module.exports = {
   createKarmaTest,
   waitToExit,
-  WriteableBuffer
 };