Remove ChromeBrowserProvider::RegisterProfilePrefs().

ios/chrome/browser/downstream_chromium_browser_provider.mm

 // Copyright 2016 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.
 
 #import "ios/chrome/browser/downstream_chromium_browser_provider.h"
 
 #import <UIKit/UIKit.h>
 
 #include <memory>
 #include <string>
 
 #include "base/memory/ptr_util.h"
-#import "components/handoff/handoff_manager.h"
 #include "ios/chrome/browser/sessions/tab_restore_service_delegate_provider_impl.h"
 #include "ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.h"
 #include "ios/chrome/browser/ui/autofill/card_unmask_prompt_view_bridge.h"
-#import "ios/chrome/browser/ui/bookmarks/bookmark_interaction_controller.h"
-#import "ios/chrome/browser/ui/bookmarks/bookmark_promo_controller.h"
 #import "ios/chrome/browser/ui/browser_list_ios.h"
 #include "ios/chrome/browser/ui/webui/chrome_web_ui_ios_controller_factory.h"
 #import "ios/chrome/common/material_timing.h"
 
 DownstreamChromiumBrowserProvider::DownstreamChromiumBrowserProvider()
     : tab_restore_service_delegate_provider_(
           base::MakeUnique<
               ios_internal::TabRestoreServiceDelegateProviderImpl>()) {}
 
 DownstreamChromiumBrowserProvider::~DownstreamChromiumBrowserProvider() {}
 
-void DownstreamChromiumBrowserProvider::RegisterProfilePrefs(
-    user_prefs::PrefRegistrySyncable* registry) {
-  [BookmarkInteractionController registerBrowserStatePrefs:registry];
-  [BookmarkPromoController registerBrowserStatePrefs:registry];
-  [HandoffManager registerBrowserStatePrefs:registry];
-}
-
 ios::LiveTabContextProvider*
 DownstreamChromiumBrowserProvider::GetLiveTabContextProvider() {
   return tab_restore_service_delegate_provider_.get();
 }
 
 void DownstreamChromiumBrowserProvider::SetUIViewAlphaWithAnimation(
     UIView* view,
     float alpha) {
   CGFloat oldAlpha = [view alpha];
   if (oldAlpha > 0 && alpha == 0) {
@@ skipping 30 matching lines @@
     const favicon_base::FaviconResultsCallback& callback) const {
   ChromeWebUIIOSControllerFactory::GetInstance()->GetFaviconForURL(
       browser_state, page_url, desired_sizes_in_pixel, callback);
 }
 
 std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
 DownstreamChromiumBrowserProvider::CreateSyncedWindowDelegatesGetter(
     ios::ChromeBrowserState* browser_state) {
   return base::MakeUnique<TabModelSyncedWindowDelegatesGetter>(browser_state);
 }