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

chrome/browser/extensions/webstore_startup_installer_browsertest.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 "base/command_line.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/startup_helper.h"
 #include "chrome/browser/extensions/webstore_installer_test.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/test_switches.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_registry.h"
@@ skipping 265 matching lines @@
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   command_line->AppendSwitchASCII(
       switches::kInstallEphemeralAppFromWebstore, kTestExtensionId);
   ExtensionInstallPrompt::g_auto_confirm_for_tests =
       ExtensionInstallPrompt::ACCEPT;
   extensions::StartupHelper helper;
   EXPECT_FALSE(helper.InstallEphemeralApp(*command_line, browser()->profile()));
   EXPECT_FALSE(saw_install());
   EXPECT_EQ(0, browser_open_count());
 }