Remove IS_IOS checks in chrome/

chrome/browser/ui/browser_ui_prefs.cc

 // 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.
 
 #include "chrome/browser/ui/browser_ui_prefs.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/translate/core/browser/translate_pref_names.h"
 #include "content/public/common/webrtc_ip_handling_policy.h"
 #include "media/media_features.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 namespace {
 
 uint32_t GetHomeButtonAndHomePageIsNewTabPageFlags() {
-#if defined(OS_IOS) || defined(OS_ANDROID)
+#if defined(OS_ANDROID)
   return PrefRegistry::NO_REGISTRATION_FLAGS;
 #else
   return user_prefs::PrefRegistrySyncable::SYNCABLE_PREF;
 #endif
 }
 
 }  // namespace
 
 namespace chrome {
 
@@ skipping 74 matching lines @@
   registry->RegisterBooleanPref(
       prefs::kShowFullscreenToolbar,
       true,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 #else
   registry->RegisterBooleanPref(prefs::kFullscreenAllowed, true);
 #endif
 }
 
 }  // namespace chrome