Revert of Add TabContainer to Showcase

ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.mm

Index: ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.mm
diff --git a/ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.mm b/ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.mm
deleted file mode 100644
index ae2c688d15620d633b2cb2359c233119aa2ac0c2..0000000000000000000000000000000000000000
--- a/ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.mm
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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 "ios/showcase/tab/sc_bottom_toolbar_tab_coordinator.h"
-
-#import "ios/clean/chrome/browser/ui/tab/tab_container_view_controller.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@implementation SCBottomToolbarTabCoordinator
-
-@synthesize baseViewController;
-
-- (void)start {
-  UIViewController* bottomToolbarTabViewController =
-      [[BottomToolbarTabViewController alloc] init];
-  bottomToolbarTabViewController.title = @"Bottom toolbar tab";
-  [self.baseViewController pushViewController:bottomToolbarTabViewController
-                                     animated:YES];
-}
-
-@end