Remove old APIs from components/task_scheduler_util/.

components/task_scheduler_util/initialization/BUILD.gn

Index: components/task_scheduler_util/initialization/BUILD.gn
diff --git a/components/task_scheduler_util/initialization/BUILD.gn b/components/task_scheduler_util/initialization/BUILD.gn
deleted file mode 100644
index 26c6ba2401dccbea57ad86aa05f8503aedb45820..0000000000000000000000000000000000000000
--- a/components/task_scheduler_util/initialization/BUILD.gn
+++ /dev/null
@@ -1,14 +0,0 @@
-# Copyright 2016 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.
-
-static_library("initialization") {
-  sources = [
-    "browser_util.cc",
-    "browser_util.h",
-  ]
-
-  deps = [
-    "//components/task_scheduler_util/browser",
-  ]
-}