[ios clean] Add placeholder for NTP bookmarks, chrome home and open tabs.

ios/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.mm

Index: ios/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.mm
diff --git a/ios/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.mm b/ios/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.mm
deleted file mode 100644
index 5dfd67c65f4d6972842270367142757c0f516571..0000000000000000000000000000000000000000
--- a/ios/clean/chrome/browser/ui/ntp/new_tab_page_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/clean/chrome/browser/ui/ntp/new_tab_page_coordinator.h"
-
-#import "ios/clean/chrome/browser/ui/ntp/new_tab_page_view_controller.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-@interface NTPCoordinator ()
-@property(nonatomic, strong) NTPViewController* viewController;
-@end
-
-@implementation NTPCoordinator
-@synthesize viewController = _viewController;
-
-- (void)start {
-  self.viewController = [[NTPViewController alloc] init];
-  [super start];
-}
-
-@end