Revert 127833 - Re-land alexbost's experimental offscreenTabs API.

chrome/renderer/resources/extensions/experimental.offscreenTabs_custom_bindings.js

-// Copyright (c) 2012 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.
-
-// Custom bindings for the experimental offscreenTabs API.
-
-(function() {
-
-native function GetChromeHidden();
-
-GetChromeHidden().registerCustomHook(
-    'experimental.offscreenTabs', function(api) {
-  var apiFunctions = api.apiFunctions;
-
-  function maybeCopy(src, prop, dest) {
-    if (src[prop] !== undefined)
-      dest[prop] = src[prop];
-  };
-
-  function keyboardEventFilter(e) {
-    var result = {
-      type: e.type,
-      ctrlKey: e.ctrlKey,
-      shiftKey: e.shiftKey,
-      altKey: e.altKey,
-      metaKey: e.metaKey,
-    };
-    maybeCopy(e, 'keyCode', result);
-    maybeCopy(e, 'charCode', result);
-    return result;
-  };
-
-  function mouseEventFilter(e) {
-    var result = {
-      type: e.type,
-      ctrlKey: e.ctrlKey,
-      shiftKey: e.shiftKey,
-      altKey: e.altKey,
-      metaKey: e.metaKey,
-      button: e.button,
-    };
-    maybeCopy(e, 'wheelDeltaX', result);
-    maybeCopy(e, 'wheelDeltaY', result);
-    return result;
-  };
-
-  // We are making a copy of |arr|, but applying |func| to index 1.
-  function validate(arr, func) {
-    var newArr = [];
-    for (var i = 0; i < arr.length; i++)
-      newArr.push(i == 1 && typeof(arr) == 'object' ? func(arr[i]) : arr[i]);
-    return newArr;
-  }
-
-  apiFunctions.setUpdateArgumentsPreValidate(
-      'sendKeyboardEvent',
-      function() { return validate(arguments, keyboardEventFilter); });
-  apiFunctions.setUpdateArgumentsPreValidate(
-      'sendMouseEvent',
-      function() { return validate(arguments, mouseEventFilter); });
-});
-
-})();