[ios] Adds a VoiceSearchController interface to the provider layer.

ios/chrome/browser/pref_names.cc

 // Copyright 2014 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 "ios/chrome/browser/pref_names.h"
 
 namespace prefs {
 
 // The value to use for Accept-Languages HTTP header when making an HTTP
 // request.
@@ skipping 92 matching lines @@
 // Preference that hold a boolean indicating whether network prediction should
 // be limited to wifi (when enabled).
 const char kNetworkPredictionWifiOnly[] = "ios.dns_prefetching.wifi_only";
 
 // Which bookmarks folder should be visible on the new tab page v4.
 const char kNtpShownBookmarksFolder[] = "ntp.shown_bookmarks_folder";
 
 // True if the memory debugging tools should be visible.
 const char kShowMemoryDebuggingTools[] = "ios.memory.show_debugging_tools";
 
-// User preferred speech input language for voice search.
-const char kVoiceSearchLocale[] = "ios.speechinput.voicesearch_locale";
-
-// Boolean which indicates if TTS after voice search is enabled.
-const char kVoiceSearchTTS[] = "ios.speechinput.voicesearch_tts";
-
 // List which contains the last known list of accounts.
 const char kSigninLastAccounts[] = "ios.signin.last_accounts";
 
 // Boolean which indicates if the pref which contains the last known list of
 // accounts was migrated to use account ids instead of emails.
 const char kSigninLastAccountsMigrated[] = "ios.signin.last_accounts_migrated";
 
 // String which contains the user id of the user signed in with shared
 // authentication.
 const char kSigninSharedAuthenticationUserId[] =
@@ skipping 14 matching lines @@
 // authorization alert.
 const char kOmniboxGeolocationLastAuthorizationAlertVersion[] =
     "ios.omnibox.geolocation_last_authorization_alert_version";
 
 // Integer which contains the timestamp at which the "Rate This App" dialog was
 // last shown.
 const char kRateThisAppDialogLastShownTime[] =
     "ios.ratethisapp.dialog_last_shown_time";
 
 }  // namespace prefs