Fix componentization of chrome/browser/bookmarks

components/bookmarks/managed/BUILD.gn

 # Copyright 2015 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.
 
 source_set("managed") {
   sources = [
+    "managed_bookmark_service.cc",
+    "managed_bookmark_service.h",
     "managed_bookmarks_tracker.cc",
     "managed_bookmarks_tracker.h",
   ]
 
   deps = [
     "//base",
     "//base:prefs",
     "//components/bookmarks/browser",
     "//components/bookmarks/common",
+    "//components/keyed_service/core",
     "//components/strings",
     "//ui/base",
     "//url",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "managed_bookmarks_tracker_unittest.cc",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":managed",
     "//base",
     "//base:prefs",
     "//base:prefs_test_support",
     "//components/bookmarks/browser",
     "//components/bookmarks/common",
     "//components/bookmarks/test",
     "//components/strings",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }