Remove --enable-firewall-hole-punching flag, default to enabled.

chrome/browser/about_flags.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/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2317 matching lines @@
     SINGLE_VALUE_TYPE(switches::kOzoneTestSingleOverlaySupport)
   },
 #endif  // defined(OS_CHROMEOS) && defined(USE_OZONE)
   {
     "v8-pac-mojo-out-of-process",
     IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_NAME,
     IDS_FLAGS_V8_PAC_MOJO_OUT_OF_PROCESS_DESCRIPTION,
     kOsDesktop,
     SINGLE_VALUE_TYPE(switches::kV8PacMojoOutOfProcess),
   },
-#if defined(OS_CHROMEOS)
-  {
-    "enable-firewall-hole-punching",
-    IDS_FLAGS_ENABLE_FIREWALL_HOLE_PUNCHING_NAME,
-    IDS_FLAGS_ENABLE_FIREWALL_HOLE_PUNCHING_DESCRIPTION,
-    kOsCrOS,
-    SINGLE_VALUE_TYPE(chromeos::switches::kEnableFirewallHolePunching)
-  },
-#endif  // defined(OS_CHROMEOS)
 #if defined(ENABLE_MEDIA_ROUTER)
   {
     "enable-media-router",
     IDS_FLAGS_ENABLE_MEDIA_ROUTER_NAME,
     IDS_FLAGS_ENABLE_MEDIA_ROUTER_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableMediaRouter)
   },
 #endif  // defined(ENABLE_MEDIA_ROUTER)
 // Since kEnableLauncherSearchProviderApi is not available when app list is
@@ skipping 649 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags