Introduce //components/user_prefs, use to eliminate c/b/prefs dependency in Autofill.

chrome/browser/autofill/autocomplete_history_manager.cc

 // Copyright (c) 2012 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 "chrome/browser/autofill/autocomplete_history_manager.h"
 
 #include <vector>
 
 #include "base/prefs/pref_service.h"
 #include "base/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autofill/autofill_external_delegate.h"
 #include "chrome/browser/autofill/validation.h"
 #include "chrome/common/autofill_messages.h"
 #include "chrome/common/form_data.h"
 #include "chrome/common/pref_names.h"
+#include "components/user_prefs/user_prefs.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 
 using base::StringPiece16;
 using content::BrowserContext;
 using content::WebContents;
 
 namespace {
 
@@ skipping 80 matching lines @@
 
 AutocompleteHistoryManager::AutocompleteHistoryManager(
     WebContents* web_contents)
     : content::WebContentsObserver(web_contents),
       browser_context_(web_contents->GetBrowserContext()),
       autofill_data_(
           AutofillWebDataService::FromBrowserContext(browser_context_)),
       pending_query_handle_(0),
       query_id_(0),
       external_delegate_(NULL) {
-  autofill_enabled_.Init(prefs::kAutofillEnabled,
-                         PrefServiceFromBrowserContext(browser_context_));
+  autofill_enabled_.Init(
+      prefs::kAutofillEnabled,
+      components::UserPrefs::Get(browser_context_));
 }
 
 AutocompleteHistoryManager::~AutocompleteHistoryManager() {
   CancelPendingQuery();
 }
 
 bool AutocompleteHistoryManager::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(AutocompleteHistoryManager, message)
@@ skipping 148 matching lines @@
                                              autofill_icons_,
                                              autofill_unique_ids_));
   }
 
   query_id_ = 0;
   autofill_values_.clear();
   autofill_labels_.clear();
   autofill_icons_.clear();
   autofill_unique_ids_.clear();
 }