Removed IsNativeAppLauncherEnabled() experiment

ios/chrome/browser/experimental_flags.mm

 // Copyright 2015 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.
 
 // This file can be empty. Its purpose is to contain the relatively short lived
 // definitions required for experimental flags.
 
 #include "ios/chrome/browser/experimental_flags.h"
 
 #include <dispatch/dispatch.h>
@@ skipping 263 matching lines @@
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableBookmarkReordering))
     return true;
   if (command_line->HasSwitch(switches::kDisableBookmarkReordering))
     return false;
 
   // By default, disable it.
   return false;
 }
 
-bool IsNativeAppLauncherEnabled() {
-  return [[NSUserDefaults standardUserDefaults]
-      boolForKey:@"NativeAppLauncherEnabled"];
-}
-
 bool IsNewFeedbackKitEnabled() {
   return [[NSUserDefaults standardUserDefaults]
       boolForKey:@"NewFeedbackKitEnabled"];
 }
 
 bool IsKeyboardAccessoryViewWithCameraSearchEnabled() {
   return [[NSUserDefaults standardUserDefaults]
       boolForKey:@"NewKeyboardAccessoryViewEnabled"];
 }
 
 bool IsSlimNavigationManagerEnabled() {
   // Check if the experimental flag is forced on or off.
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kEnableSlimNavigationManager)) {
     return true;
   } else if (command_line->HasSwitch(switches::kDisableSlimNavigationManager)) {
     return false;
   }
 
   // Check if the Finch experiment is turned on.
   return base::FeatureList::IsEnabled(kEnableSlimNavigationManager);
 }
 
 }  // namespace experimental_flags