distiller: Retires support of CreateNewContext.

components/dom_distiller/core/javascript/domdistiller.js

 // Copyright 2014 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.
 
 // Applies DomDistillerJs to the content of the page and returns a
 // DomDistillerResults (as a javascript object/dict).
-(function(options, stringify_output, use_new_context) {
+(function(options, stringify_output) {
   try {
-    // The generated domdistiller.js accesses the window object only explicitly
-    // via the window name. So, we create a new object with the normal window
-    // object as its prototype and initialize the domdistiller.js with that new
-    // context so that it doesn't change the real window object.
-    function initialize(window) {
+    function initialize() {
       // This include will be processed at build time by grit.
       <include src="../../../../third_party/dom_distiller_js/dist/js/domdistiller.js"/>
     }
-    var context = use_new_context ? Object.create(window) : window
-    context.setTimeout = function() {};
-    context.clearTimeout = function() {};
-    initialize(context);
+    window.setTimeout = function() {};
+    window.clearTimeout = function() {};
+    initialize();
 
     // The OPTIONS placeholder will be replaced with the DomDistillerOptions at
     // runtime.
-    var distiller = context.org.chromium.distiller.DomDistiller;
+    var distiller = window.org.chromium.distiller.DomDistiller;
     var res = distiller.applyWithOptions(options);
 
     if (stringify_output) {
       return JSON.stringify(res);
     }
     return res;
   } catch (e) {
     window.console.error("Error during distillation: " + e);
     if (e.stack != undefined) window.console.error(e.stack);
   }
   return undefined;
 })(options = $$OPTIONS,
-   stringify_output = $$STRINGIFY,
-   use_new_context = $$NEW_CONTEXT)
+   stringify_output = $$STRINGIFY)