Fixing signed in message and disconnect/reconnect case.

remoting/ios/app/host_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/host_view_controller.h"
 
@@ skipping 292 matching lines @@
             ? remoting::GestureInterpreter::TRACKPAD_INPUT_MODE
             : remoting::GestureInterpreter::DIRECT_INPUT_MODE);
     [_actionImageView setActive:NO animated:YES];
   };
   [alert addAction:[UIAlertAction actionWithTitle:switchInputModeTitle
                                             style:UIAlertActionStyleDefault
                                           handler:switchInputModeHandler]];
 
   void (^disconnectHandler)(UIAlertAction*) = ^(UIAlertAction*) {
     [_client disconnectFromHost];
-    [self.navigationController popViewControllerAnimated:YES];
+    [self.navigationController popToRootViewControllerAnimated:YES];
     [_actionImageView setActive:NO animated:YES];
   };
   [alert addAction:[UIAlertAction actionWithTitle:@"Disconnect"
                                             style:UIAlertActionStyleDefault
                                           handler:disconnectHandler]];
 
   __weak HostViewController* weakSelf = self;
   void (^settingsHandler)(UIAlertAction*) = ^(UIAlertAction*) {
     RemotingSettingsViewController* settingsViewController =
         [[RemotingSettingsViewController alloc] init];
@@ skipping 22 matching lines @@
   alert.popoverPresentationController.sourceRect = CGRectMake(
       _floatingButton.center.x, _floatingButton.frame.origin.y, 1.0, 1.0);
 
   alert.popoverPresentationController.permittedArrowDirections =
       UIPopoverArrowDirectionDown;
   [self presentViewController:alert animated:YES completion:nil];
   [_actionImageView setActive:YES animated:YES];
 }
 
 @end