Remove IS_IOS checks in chrome/

chrome/common/pref_names.h

 // Copyright (c) 2012 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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 318 matching lines @@
 extern const char kPinUnlockMaximumLength[];
 extern const char kPinUnlockWeakPinsAllowed[];
 extern const char kEnableQuickUnlockFingerprint[];
 extern const char kInstantTetheringAllowed[];
 extern const char kInstantTetheringEnabled[];
 #endif  // defined(OS_CHROMEOS)
 extern const char kShowHomeButton[];
 extern const char kSpeechRecognitionFilterProfanities[];
 extern const char kSavingBrowserHistoryDisabled[];
 extern const char kAllowDeletingBrowserHistory[];
-#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#if !defined(OS_ANDROID)
 extern const char kMdHistoryMenuPromoShown[];
 #endif
 extern const char kForceGoogleSafeSearch[];
 extern const char kForceYouTubeRestrict[];
 extern const char kForceSessionSync[];
 extern const char kAllowedDomainsForApps[];
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 extern const char kUsesSystemTheme[];
 #endif
 extern const char kCurrentThemePackFilename[];
@@ skipping 575 matching lines @@
 extern const char kClipboardLastModifiedTime[];
 #endif
 
 #if BUILDFLAG(ENABLE_OFFLINE_PAGES)
 extern const char kOfflinePrefetchBackoff[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_