Expose proxy profile configs to OS_IOS

chrome/browser/ui/prefs/prefs_tab_helper.cc

Index: chrome/browser/ui/prefs/prefs_tab_helper.cc
diff --git a/chrome/browser/ui/prefs/prefs_tab_helper.cc b/chrome/browser/ui/prefs/prefs_tab_helper.cc
index 2e3c8ab1239342f9acbc7b5c4268ab51fe1c740a..ef5ad40fafb10868c49179a27ad3aa5b53086d1b 100644
--- a/chrome/browser/ui/prefs/prefs_tab_helper.cc
+++ b/chrome/browser/ui/prefs/prefs_tab_helper.cc
@@ -444,9 +444,9 @@ void PrefsTabHelper::InitIncognitoUserPrefStore(
   // profile.  All preferences that store information about the browsing history
   // or behavior of the user should have this property.
   pref_store->RegisterOverlayPref(prefs::kBrowserWindowPlacement);
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || defined(OS_IOS)
   pref_store->RegisterOverlayPref(prefs::kProxy);
-#endif
+#endif  // defined(OS_ANDROID) || defined(OS_IOS)
 }
 
 // static