Move undo files into //components/undo

components/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 77 matching lines @@
     "//components/startup_metric_utils",
     "//components/strings",
     "//components/sync_driver",
     "//components/tracing",
     "//components/translate/content/browser",
     "//components/translate/content/common",
     "//components/translate/content/renderer",
     "//components/translate/core/browser",
     "//components/translate/core/common",
     "//components/ui/zoom:ui_zoom",
+    "//components/undo",
     "//components/update_client",
     "//components/url_fixer",
     "//components/url_matcher",
     "//components/user_manager",
     "//components/user_prefs",
     "//components/variations",
     "//components/visitedlink/browser",
     "//components/visitedlink/common",
     "//components/visitedlink/renderer",
     "//components/wallpaper",
@@ skipping 152 matching lines @@
     "//components/dom_distiller/core:unit_tests",
     "//components/domain_reliability:unit_tests",
     "//components/favicon_base:unit_tests",
     "//components/google/core/browser:unit_tests",
     "//components/invalidation:unittests",
     "//components/login:unit_tests",
     "//components/metrics:unit_tests",
     "//components/omnibox:unit_tests",
     "//components/ownership:unit_tests",
     "//components/packed_ct_ev_whitelist:unit_tests",
+    "//components/undo:unit_tests",
     "//components/update_client:unit_tests",
     "//components/variations:unit_tests",
     "//components/web_resource:unit_tests",
     "//components/webcrypto:unit_tests",
     "//components/webdata/common:unit_tests",
 
     # These are the deps required by the code in this target.
     "//base",
     "//base/test:test_support",
     "//content/test:test_support",
@@ skipping 98 matching lines @@
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     "//base",
     "//base/test:test_support_perf",
     "//testing/gtest",
     "//content/test:test_support",
     "//components/visitedlink/browser",
   ]
 }