Remove --enable-ipv6 and --disable-ipv6 command line flags.

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 249 matching lines @@
 // Disable checking for user opt-in for extensions that want to inject script
 // into file URLs (ie, always allow it). This is used during automated testing.
 const char kDisableExtensionsFileAccessCheck[] =
     "disable-extensions-file-access-check";
 
 // Disable the net::URLRequestThrottlerManager functionality for
 // requests originating from extensions.
 const char kDisableExtensionsHttpThrottling[] =
     "disable-extensions-http-throttling";
 
-// Don't resolve hostnames to IPv6 addresses. This can be used when debugging
-// issues relating to IPv6, but shouldn't otherwise be needed. Be sure to file
-// bugs if something isn't working properly in the presence of IPv6. This flag
-// can be overidden by the "enable-ipv6" flag.
-const char kDisableIPv6[]                   = "disable-ipv6";
-
 // Disable the behavior that the second click on a launcher item (the click when
 // the item is already active) minimizes the item.
 const char kDisableMinimizeOnSecondLauncherItemClick[] =
     "disable-minimize-on-second-launcher-item-click";
 
 // Disables the new bookmark app system.
 const char kDisableNewBookmarkApps[]        = "disable-new-bookmark-apps";
 
 // Disables the new offline error page generated by NetErrorHelper for ChromeOS
 // and instead uses the old error page generated by OfflineResourceThrottle.
@@ skipping 152 matching lines @@
     "enable-extension-activity-logging";
 
 const char kEnableExtensionActivityLogTesting[] =
     "enable-extension-activity-log-testing";
 
 // Enable the fast unload controller, which speeds up tab/window close by
 // running a tab's onunload js handler independently of the GUI -
 // crbug.com/142458 .
 const char kEnableFastUnload[]         = "enable-fast-unload";
 
-// Enables IPv6 support, even if probes suggest that it may not be fully
-// supported. Some probes may require internet connections, and this flag will
-// allow support independent of application testing. This flag overrides
-// "disable-ipv6" which appears elswhere in this file.
-const char kEnableIPv6[]                    = "enable-ipv6";
-
 // Enables experimentation with launching ephemeral apps via hyperlinks.
 const char kEnableLinkableEphemeralApps[]   = "enable-linkable-ephemeral-apps";
 
 // Enables the material design Settings feature.
 const char kEnableMaterialDesignSettings[]  = "enable-md-settings";
 
 // Enables Media Router.
 const char kEnableMediaRouter[]             = "enable-media-router";
 
 // Runs the Native Client inside the renderer process and enables GPU plugin
@@ skipping 908 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches