Move EarlGrey helper to check toolbar visibility into ChromeEarlGreyUI.

ios/chrome/test/earl_grey/BUILD.gn

 # Copyright 2016 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("//ios/chrome/test/earl_grey/chrome_ios_eg_test.gni")
 
 group("all_tests") {
   testonly = true
   deps = [
     ":ios_chrome_device_check_egtests",
@@ skipping 135 matching lines @@
     "chrome_assertions.h",
     "chrome_assertions.mm",
     "chrome_earl_grey.h",
     "chrome_earl_grey.mm",
     "chrome_earl_grey_ui.h",
     "chrome_earl_grey_ui.mm",
     "chrome_matchers.h",
     "chrome_matchers.mm",
     "chrome_test_case.h",
     "chrome_test_case.mm",
-    "chrome_util.h",
-    "chrome_util.mm",
   ]
 
   deps = [
     "//base",
     "//base/test:test_support",
     "//components/strings",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/collection_view/cells",
     "//ios/chrome/browser/ui/omnibox:omnibox_internal",
@@ skipping 24 matching lines @@
 
 source_set("hooks") {
   testonly = true
   sources = [
     "eg_tests_hook.mm",
   ]
   deps = [
     "//ios/chrome/app:tests_hook",
   ]
 }