Delete "Experimental WebSocket" flag from chrome://flags.

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 <algorithm>
 #include <iterator>
 #include <map>
 #include <set>
@@ skipping 1241 matching lines @@
     "delegated-renderer",
     IDS_FLAGS_DELEGATED_RENDERER_NAME,
     IDS_FLAGS_DELEGATED_RENDERER_DESCRIPTION,
 #ifdef USE_AURA
     kOsWin | kOsLinux |
 #endif
     kOsAndroid | kOsCrOS,
     MULTI_VALUE_TYPE(kDelegatedRendererChoices)
   },
   {
-    "enable-websocket-experimental-implementation",
-    IDS_FLAGS_ENABLE_EXPERIMENTAL_WEBSOCKET_NAME,
-    IDS_FLAGS_ENABLE_EXPERIMENTAL_WEBSOCKET_DESCRIPTION,
-    kOsAll,
-    SINGLE_VALUE_TYPE(switches::kEnableExperimentalWebSocket)
-  },
-  {
     "max-tiles-for-interest-area",
     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_NAME,
     IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_DESCRIPTION,
     kOsAll,
     MULTI_VALUE_TYPE(kMaxTilesForInterestAreaChoices)
   },
   {
     "enable-offline-mode",
     IDS_FLAGS_ENABLE_OFFLINE_MODE_NAME,
     IDS_FLAGS_ENABLE_OFFLINE_MODE_DESCRIPTION,
@@ skipping 1076 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags