Move EarlGrey helper to check toolbar visibility into ChromeEarlGreyUI.

ios/chrome/test/earl_grey/chrome_util.h

Index: ios/chrome/test/earl_grey/chrome_util.h
diff --git a/ios/chrome/test/earl_grey/chrome_util.h b/ios/chrome/test/earl_grey/chrome_util.h
deleted file mode 100644
index bd09c489406fbb9279ba26c47cd680f27daa6bc4..0000000000000000000000000000000000000000
--- a/ios/chrome/test/earl_grey/chrome_util.h
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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.
-
-#ifndef IOS_CHROME_TEST_EARL_GREY_CHROME_UTIL_H_
-#define IOS_CHROME_TEST_EARL_GREY_CHROME_UTIL_H_
-
-namespace chrome_test_util {
-
-// Asserts that the toolbar is not visible.
-void AssertToolbarNotVisible();
-
-// Asserts that the toolbar is visible.
-void AssertToolbarVisible();
-
-}  // namespace chrome_test_util
-
-#endif  // IOS_CHROME_TEST_EARL_GREY_CHROME_UTIL_H_