Revert of Implements RLZTrackerDelegate on iOS.

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 ios {
 namespace prefs {
 
 // Preferences in ios::prefs:: must have the same value as the corresponding
 // preference on desktop.
 // These preferences must not be registered by //ios code.
 // See chrome/common/pref_names.cc for a detailed description of each
 // preference.
 
 const char kAcceptLanguages[] = "intl.accept_languages";
-const char kHomePage[] = "homepage";
 const char kSavingBrowserHistoryDisabled[] = "history.saving_disabled";
 
 }  // namespace prefs
 }  // namespace ios
 
 namespace prefs {
 
 // *************** CHROME BROWSER STATE PREFS ***************
 // These are attached to the user Chrome browser state.
 
@@ skipping 71 matching lines @@
 // authorization.
 extern const char kOmniboxGeolocationAuthorizationState[] =
     "ios.omnibox.geolocation_authorization_state";
 
 // String which contains the application version when we last showed the
 // authorization alert.
 extern const char kOmniboxGeolocationLastAuthorizationAlertVersion[] =
     "ios.omnibox.geolocation_last_authorization_alert_version";
 
 }  // namespace prefs