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

chrome/browser/ui/views/home_button.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/ui/views/home_button.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/pref_names.h"
+#include "components/user_prefs/user_prefs.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/link.h"
 #include "ui/views/controls/link_listener.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/layout/layout_constants.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 85 matching lines @@
   layout->StartRow(0, 1);
   layout->AddView(message_label);
 
   views::Link* undo_link = new views::Link(
       l10n_util::GetStringUTF16(IDS_ONE_CLICK_BUBBLE_UNDO));
   undo_link->set_listener(this);
   layout->AddView(undo_link);
 }
 
 void HomePageUndoBubble::LinkClicked(views::Link* source, int event_flags) {
-  PrefService* prefs = PrefServiceFromBrowserContext(browser_->profile());
+  PrefService* prefs =
+      components::UserPrefs::GetInstance()->Lookup(browser_->profile());
   prefs->SetBoolean(prefs::kHomePageIsNewTabPage, undo_value_is_ntp_);
   prefs->SetString(prefs::kHomePage, undo_url_.spec());
 
   HideBubble();
 }
 
 void HomePageUndoBubble::WindowClosing() {
   // We have to reset |home_page_undo_bubble_| here, not in our destructor,
   // because we'll be hidden first, then destroyed asynchronously.  If we wait
   // to reset this, and the user triggers a call to ShowBubble() while the
@@ skipping 43 matching lines @@
     bool old_is_ntp = prefs->GetBoolean(prefs::kHomePageIsNewTabPage);
     GURL old_homepage(prefs->GetString(prefs::kHomePage));
 
     prefs->SetBoolean(prefs::kHomePageIsNewTabPage, false);
     prefs->SetString(prefs::kHomePage, new_homepage_url.spec());
 
     HomePageUndoBubble::ShowBubble(browser_, old_is_ntp, old_homepage, this);
   }
   return ui::DragDropTypes::DRAG_NONE;
 }