Cleanup: Remove unneeded chrome/common/pref_names.h includes.

chrome/browser/ui/cocoa/view_id_util_browsertest.mm

 // 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/devtools/devtools_window_testing.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/cocoa/view_id_util.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/browser/bookmark_utils.h"
 #include "components/bookmarks/test/bookmark_test_helpers.h"
 #include "extensions/common/switches.h"
 
 using content::OpenURLParams;
 using content::Referrer;
 
@@ skipping 92 matching lines @@
   }
 
   // Open the 11th tab.
   browser()->OpenURL(OpenURLParams(GURL(url::kAboutBlankURL),
                                    Referrer(),
                                    NEW_BACKGROUND_TAB,
                                    ui::PAGE_TRANSITION_TYPED,
                                    false));
   CheckViewID(VIEW_ID_TAB_LAST, true);
 }