[ios] RootCoordinator and view controller.

ios/clean/chrome/app/app_delegate.mm

 // 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/clean/chrome/app/app_delegate.h"
 
 #import "ios/clean/chrome/app/application_state.h"
 #import "ios/clean/chrome/app/steps/launch_to_background.h"
 #import "ios/clean/chrome/app/steps/launch_to_basic.h"
 #import "ios/clean/chrome/app/steps/launch_to_foreground.h"
-#import "ios/clean/chrome/app/steps/tab_grid_coordinator+application_step.h"
+#import "ios/clean/chrome/app/steps/root_coordinator+application_step.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface AppDelegate ()
 @property(nonatomic, strong) ApplicationState* applicationState;
 @end
 
 @implementation AppDelegate
@@ skipping 80 matching lines @@
 // needed.
 - (void)configureApplicationState {
   [self.applicationState.launchSteps addObjectsFromArray:@[
     [[ProviderInitializer alloc] init],
     [[SetupBundleAndUserDefaults alloc] init],
     [[StartChromeMain alloc] init],
     [[SetBrowserState alloc] init],
     [[BeginForegrounding alloc] init],
     [[PrepareForUI alloc] init],
     [[CompleteForegrounding alloc] init],
-    [[TabGridCoordinator alloc] init],
+    [[RootCoordinator alloc] init],
   ]];
 }
 
 @end