Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/chromeos/status/clock_menu_button_browsertest.cc

 // Copyright (c) 2010 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/chromeos/status/clock_menu_button.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/system_library.h"
 #include "chrome/browser/chromeos/frame/browser_view.h"
 #include "chrome/browser/chromeos/status/status_area_view.h"
 #include "chrome/browser/chromeos/view_ids.h"
 #include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/in_process_browser_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "unicode/calendar.h"
 #include "unicode/timezone.h"
 
 namespace chromeos {
 
 class ClockMenuButtonTest : public InProcessBrowserTest {
  protected:
   ClockMenuButtonTest() : InProcessBrowserTest() {}
@@ skipping 19 matching lines @@
   CrosLibrary::Get()->GetSystemLibrary()->SetTimezone(timezone_first.get());
   std::wstring text_before = clock->text();
   scoped_ptr<icu::TimeZone> timezone_second(icu::TimeZone::createTimeZone(
       icu::UnicodeString::fromUTF8("Pacific/Samoa")));
   CrosLibrary::Get()->GetSystemLibrary()->SetTimezone(timezone_second.get());
   std::wstring text_after = clock->text();
   EXPECT_NE(text_before, text_after);
 }
 
 }  // namespace chromeos