Fix bug: AppShell: CHECK failure in PeerConnection init.

extensions/common/switches.cc

 // Copyright 2013 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 "extensions/common/switches.h"
 
 namespace extensions {
 
 namespace switches {
 
 // Allows non-https URL for background_page for hosted apps.
 const char kAllowHTTPBackgroundPage[] = "allow-http-background-page";
 
 // Allows the browser to load extensions that lack a modern manifest when that
 // would otherwise be forbidden.
 const char kAllowLegacyExtensionManifests[] =
     "allow-legacy-extension-manifests";
 
-// Request pages to be dumped as text once they finished loading.
-const char kDumpRenderTree[] = "dump-render-tree";
-
 // Enables extension options to be embedded in chrome://extensions rather than
 // a new tab.
 const char kEmbeddedExtensionOptions[] = "embedded-extension-options";
 
 // Show apps windows after the first paint. Windows will be shown significantly
 // later for heavy apps loading resources synchronously but it will be
 // insignificant for apps that load most of their resources asynchronously.
 const char kEnableAppsShowOnFirstPaint[] = "enable-apps-show-on-first-paint";
 
 // Enables the <window-controls> tag in platform apps.
@@ skipping 62 matching lines @@
 // Makes component extensions appear in chrome://settings/extensions.
 const char kShowComponentExtensionOptions[] =
     "show-component-extension-options";
 
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[] = "whitelisted-extension-id";
 
 }  // namespace switches
 
 }  // namespace extensions