Remove ChromeBrowserProvider::RegisterProfilePrefs().

ios/chrome/browser/BUILD.gn

 # Copyright 2015 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("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ios/rules.gni")
 import("//rlz/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 246 matching lines @@
   ]
 }
 
 source_set("downstream_provider") {
   sources = [
     "downstream_chromium_browser_provider.h",
     "downstream_chromium_browser_provider.mm",
   ]
   deps = [
     "//base",
-    "//components/handoff",
     "//components/pref_registry",
     "//components/prefs",
     "//ios/chrome/browser",
     "//ios/chrome/browser/autofill:autofill_internal",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/browser_state:browser_state_impl",
     "//ios/chrome/browser/providers",
     "//ios/chrome/browser/sessions:sessions_internal",
     "//ios/chrome/browser/sync/glue",
     "//ios/chrome/browser/sync/sessions",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/tabs:tabs_internal",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui:browser_list",
     "//ios/chrome/browser/ui/autofill:autofill_internal",
-    "//ios/chrome/browser/ui/bookmarks",
     "//ios/chrome/browser/ui/webui:webui_internal",
     "//ios/chrome/common",
   ]
 }
 
 source_set("downstream_provider_factory") {
   sources = [
     "downstream_chromium_browser_provider_factory.mm",
   ]
   deps = [
@@ skipping 13 matching lines @@
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
     "//base",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
   ]
 }