Remove the syzygy optimization code.

BUILD.gn

 # Copyright (c) 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 133 matching lines @@
       "//printing:printing_unittests",
       "//sql:sql_unittests",
       "//ui/base:ui_base_unittests",
       "//ui/gfx:gfx_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//ui/views:views_unittests",
       "//url:url_unittests",
     ]
   }
 
-  # TODO(sebmarchand): Remove this once we stop supporting Syzygy (M54+).
   group("All_syzygy") {
-    if (is_syzyasan || syzygy_optimize) {
+    if (is_syzyasan) {
       deps = [
         "//chrome/installer/mini_installer:mini_installer",
         "//chrome/installer/mini_installer:mini_installer_syzygy",
       ]
     }
   }
 
   if (is_syzyasan) {
     group("chrome_official_syzyasan_builder") {
       deps = [
@@ skipping 988 matching lines @@
       "//ui/display:display_unittests",
       "//ui/events:events_unittests",
       "//ui/gfx:gfx_unittests",
       "//ui/gl:gl_unittests",
       "//ui/keyboard:keyboard_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//url:url_unittests",
     ]
   }
 }