Update GN build files for new prefs location.

components/omnibox/browser/BUILD.gn

Index: components/omnibox/browser/BUILD.gn
diff --git a/components/omnibox/browser/BUILD.gn b/components/omnibox/browser/BUILD.gn
index 703e5aa544d8c64dad5ece1b4f1fa49fafbed6fa..329a1af83eb9a17d886c88abc7fab8b5183a3936 100644
--- a/components/omnibox/browser/BUILD.gn
+++ b/components/omnibox/browser/BUILD.gn
@@ -110,7 +110,6 @@ source_set("browser") {
     ":in_memory_url_index_cache_proto",
     "//base",
     "//base:i18n",
-    "//base:prefs",
     "//components/bookmarks/browser",
     "//components/data_use_measurement/core",
     "//components/keyed_service/core",
@@ -118,6 +117,7 @@ source_set("browser") {
     "//components/omnibox/common",
     "//components/open_from_clipboard",
     "//components/pref_registry",
+    "//components/prefs",
     "//components/query_parser",
     "//components/resources",
     "//components/search",
@@ -205,13 +205,12 @@ source_set("unit_tests") {
     ":browser",
     ":test_support",
     "//base",
-    "//base:prefs",
-    "//base:prefs_test_support",
     "//base/test:test_support",
     "//components/bookmarks/browser",
     "//components/bookmarks/test",
     "//components/history/core/test",
     "//components/open_from_clipboard:test_support",
+    "//components/prefs:test_support",
     "//components/search",
     "//components/search_engines",
     "//components/url_formatter",