Revert of Implements RLZTrackerDelegate on iOS.

ios/chrome/browser/pref_names.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_PREF_NAMES_H_
 #define IOS_CHROME_BROWSER_PREF_NAMES_H_
 
 namespace ios {
 namespace prefs {
 
 // Preferences in ios::prefs:: are temporary shared with desktop Chrome.
 // Non-shared preferences should be in the prefs:: namespace (no ios::).
 extern const char kAcceptLanguages[];
-extern const char kHomePage[];
 extern const char kSavingBrowserHistoryDisabled[];
 
 }  // namespace prefs
 }  // namespace ios
 
 namespace prefs {
 
 extern const char kContextualSearchEnabled[];
 extern const char kIosBookmarkFolderDefault[];
 extern const char kIosBookmarkPromoAlreadySeen[];
@@ skipping 12 matching lines @@
 extern const char kSigninLastAccounts[];
 extern const char kSigninSharedAuthenticationUserId[];
 extern const char kSigninShouldPromptForSigninAgain[];
 
 extern const char kOmniboxGeolocationAuthorizationState[];
 extern const char kOmniboxGeolocationLastAuthorizationAlertVersion[];
 
 }  // namespace prefs
 
 #endif  // IOS_CHROME_BROWSER_PREF_NAMES_H_