components: Add GN Build files for component_updater and user_manager.

components/BUILD.gn

Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index 6d5203d3af8f85ce435a5e8c927c46e881d1445f..62b7a26497eca98842e2303bc05f22b2a41e0d06 100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -18,6 +18,7 @@ group("all_components") {
     "//components/bookmarks/test",
     "//components/captive_portal",
     "//components/cloud_devices/common",
+    "//components/component_updater",
     "//components/data_reduction_proxy/browser",
     "//components/data_reduction_proxy/common",
     "//components/dom_distiller/core",
@@ -70,6 +71,7 @@ group("all_components") {
     "//components/url_fixer",
     "//components/url_matcher",
     "//components/usb_service",
+    "//components/user_manager",
     "//components/user_prefs",
     "//components/variations",
     "//components/visitedlink/browser",