Run content scripts in their own isolated world.

chrome/browser/renderer_host/browser_render_process_host.cc

 // Copyright (c) 2006-2009 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "chrome/browser/renderer_host/browser_render_process_host.h"
 
 #include "build/build_config.h"
@@ skipping 261 matching lines @@
     switches::kSilentDumpOnDCHECK,
     switches::kUseLowFragHeapCrt,
     switches::kEnableWebWorkers,
     switches::kEnableStatsTable,
     switches::kEnableExtensions,
     switches::kDisableOutOfProcessDevTools,
     switches::kAutoSpellCorrect,
     switches::kDisableAudio,
     switches::kSimpleDataSource,
     switches::kEnableBenchmarking,
+    switches::kIsolatedWorld,
   };
 
   for (size_t i = 0; i < arraysize(switch_names); ++i) {
     if (browser_command_line.HasSwitch(switch_names[i])) {
       cmd_line.AppendSwitchWithValue(switch_names[i],
           browser_command_line.GetSwitchValue(switch_names[i]));
     }
   }
 
   // Pass on the browser locale.
@@ skipping 569 matching lines @@
   ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
   ems->AddEventListener(event_name, pid());
 }
 
 void BrowserRenderProcessHost::OnExtensionRemoveListener(
     const std::string& event_name) {
   URLRequestContext* context = profile()->GetRequestContext();
   ExtensionMessageService* ems = ExtensionMessageService::GetInstance(context);
   ems->RemoveEventListener(event_name, pid());
 }