Remove old-checkbox-style flag, code and assets

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 1019 matching lines @@
 #endif  // defined(OS_CHROMEOS)
   {
     "views-textfield",
     IDS_FLAGS_VIEWS_TEXTFIELD_NAME,
     IDS_FLAGS_VIEWS_TEXTFIELD_DESCRIPTION,
     kOsWin,
     ENABLE_DISABLE_VALUE_TYPE(switches::kEnableViewsTextfield,
                               switches::kDisableViewsTextfield),
   },
   {
-    "old-checkbox-style",
-    IDS_FLAGS_OLD_CHECKBOX_STYLE,
-    IDS_FLAGS_OLD_CHECKBOX_STYLE_DESCRIPTION,
-    kOsLinux | kOsCrOS,
-    SINGLE_VALUE_TYPE(switches::kOldCheckboxStyle),
-  },
-  {
     "enable-new-dialog-style",
     IDS_FLAGS_ENABLE_NEW_DIALOG_STYLE_NAME,
     IDS_FLAGS_ENABLE_NEW_DIALOG_STYLE_DESCRIPTION,
     kOsWin | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kEnableNewDialogStyle),
   },
   { "disable-accelerated-video-decode",
     IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_NAME,
     IDS_FLAGS_DISABLE_ACCELERATED_VIDEO_DECODE_DESCRIPTION,
     kOsDesktop,
@@ skipping 763 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags