Move ManagedBookmarksTracker from policy/core/browser to bookmarks/managed

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_bookmarks_tracker.cc",
+    "managed_bookmarks_tracker.h",
+  ]
+
+  deps = [
+    "//components/bookmarks/browser",
+    "//components/strings",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "managed_bookmarks_tracker_unittest.cc",
+  ]
+
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
+  deps = [
+    ":managed",
+    "//components/bookmarks/test",
+    "//components/strings",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}