[ios] Adds LocationBarCoordinator.

ios/shared/chrome/browser/ui/omnibox/BUILD.gn

 # Copyright 2017 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("omnibox") {
   sources = [
     "location_bar_controller.cc",
     "location_bar_controller.h",
     "location_bar_delegate.h",
     "web_omnibox_edit_controller.cc",
     "web_omnibox_edit_controller.h",
   ]
   deps = [
     "//base",
     "//components/omnibox/browser",
+    "//ui/base",
   ]
 }