[CRD iOS] Use UINavigationController for view stack manipulation

remoting/ios/app/remoting_view_controller.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.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/ios/app/remoting_view_controller.h"
 
@@ skipping 169 matching lines @@
            completion:(void (^)())completionBlock {
   if (![cell.hostInfo isOnline]) {
     MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
     message.text = @"Host is offline.";
     [MDCSnackbarManager showMessage:message];
     return;
   }
 
   ClientConnectionViewController* clientConnectionViewController =
       [[ClientConnectionViewController alloc] initWithHostInfo:cell.hostInfo];
-  [self presentViewController:clientConnectionViewController
-                     animated:YES
-                   completion:nil];
+  [self.navigationController pushViewController:clientConnectionViewController
+                                       animated:YES];
   completionBlock();
 }
 
 - (NSInteger)getHostCount {
   return _remotingService.hosts.count;
 }
 
 - (HostInfo*)getHostAtIndexPath:(NSIndexPath*)path {
   return _remotingService.hosts[path.row];
 }
@@ skipping 48 matching lines @@
   MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
   if (_isAuthenticated) {
     message.text = [NSString
         stringWithFormat:@"Currently signed in as %@.",
                          _remotingService.authentication.user.userEmail];
     [MDCSnackbarManager showMessage:message];
   }
 }
 
 @end