Move prefs-related files under chrome/browser/ into a prefs/ subdir.

chrome/browser/extensions/extension_proxy_apitest.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/browser.h"
 #include "chrome/browser/extensions/extension_apitest.h"
-#include "chrome/browser/pref_service.h"
+#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/pref_names.h"
 
 // Tests setting a single proxy to cover all schemes.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, ProxySingle) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);
 
   ASSERT_TRUE(RunExtensionTest("proxy/single")) << message_;
@@ skipping 23 matching lines @@
   PrefService* pref_service = browser()->profile()->GetPrefs();
 
   // There should be no values superseding the extension-set proxy in this test.
   std::string proxy_server = pref_service->GetString(prefs::kProxyServer);
 
   ASSERT_EQ("http=http://1.1.1.1;"
             "https=socks://2.2.2.2;"
             "ftp=http://3.3.3.3:9000;"
             "socks=socks4://4.4.4.4:9090", proxy_server);
 }