Remove HTTP cache Record/Playback support

chrome/renderer/playback_extension.cc

-// Copyright (c) 2011 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.
-
-#include "chrome/renderer/playback_extension.h"
-
-#include "v8/include/v8.h"
-
-const char kPlaybackExtensionName[] = "v8/PlaybackMode";
-
-namespace extensions_v8 {
-
-v8::Extension* PlaybackExtension::Get() {
-  v8::Extension* extension = new v8::Extension(
-      kPlaybackExtensionName,
-      "(function () {"
-      "  var orig_date = Date;"
-      "  var x = 0;"
-      "  var time_seed = 1204251968254;"
-      "  Math.random = function() {"
-      "    x += .1;"
-      "    return (x % 1);"
-      "  };"
-      "  Date = function() {"
-      "    if (this instanceof Date) {"
-      "      switch (arguments.length) {"
-      "        case 0: return new orig_date(time_seed += 50);"
-      "        case 1: return new orig_date(arguments[0]);"
-      "        default: return new orig_date(arguments[0], arguments[1],"
-      "            arguments.length >= 3 ? arguments[2] : 1,"
-      "            arguments.length >= 4 ? arguments[3] : 0,"
-      "            arguments.length >= 5 ? arguments[4] : 0,"
-      "            arguments.length >= 6 ? arguments[5] : 0,"
-      "            arguments.length >= 7 ? arguments[6] : 0);"
-      "      }"
-      "    }"
-      "    return new Date().toString();"
-      "  };"
-      "  Date.__proto__ = orig_date;"
-      "  Date.prototype.constructor = Date;"
-      "  orig_date.now = function() {"
-      "    return new Date().getTime();"
-      "  };"
-      "})()");
-    return extension;
-}
-
-}  // namespace extensions_v8