Revert of [ios showcase] Integrated TextBadgeView with Showcase.

ios/showcase/text_badge_view/sc_text_badge_view_egtest.mm

-// 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.
-
-#import <EarlGrey/EarlGrey.h>
-
-#import "ios/showcase/test/showcase_eg_utils.h"
-#import "ios/showcase/test/showcase_test_case.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-using ::showcase_utils::Open;
-using ::showcase_utils::Close;
-}
-
-@interface TextBadgeViewTestCase : ShowcaseTestCase
-@end
-
-@implementation TextBadgeViewTestCase
-
-// Tests that the accessibility label matches the display text.
-- (void)testTextBadgeAccessibilityLabel {
-  Open(@"TextBadgeView");
-  Close();
-}
-
-@end