Revert of components: Fix 'gn check' errors for omnibox.

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 10461811835c9511109415aa406b9f66dc905e41..a801e7013ba1ff52081ca2f8db7f916855b67993 100644
--- a/components/omnibox/browser/BUILD.gn
+++ b/components/omnibox/browser/BUILD.gn
@@ -84,7 +84,6 @@
     ":in_memory_url_index_cache_proto",
     "//base",
     "//base:i18n",
-    "//base:prefs",
     "//components/bookmarks/browser",
     "//components/keyed_service/core",
     "//components/pref_registry",
@@ -92,7 +91,6 @@
     "//components/resources",
     "//components/search",
     "//components/search_engines",
-    "//components/sessions:shared",
     "//components/strings",
     "//components/url_fixer",
     "//components/variations",
@@ -124,8 +122,6 @@
     ":browser",
     "//base",
     "//components/metrics/proto",
-    "//components/search_engines",
-    "//net",
     "//testing/gmock",
   ]
 }
@@ -148,12 +144,7 @@
   deps = [
     ":browser",
     ":test_support",
-    "//base",
-    "//components/search",
-    "//components/search_engines",
-    "//components/variations",
     "//testing/gmock",
     "//testing/gtest",
-    "//url",
   ]
 }