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

chrome/browser/extensions/extension_tabs_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/extensions/extension_apitest.h"
 
 #include "chrome/browser/browser.h"
-#include "chrome/browser/pref_service.h"
+#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profile.h"
 #include "chrome/common/pref_names.h"
 
 // Tabs is flaky on chromeos and linux views build.
 // http://crbug.com/48920
 #if defined(OS_LINUX) && defined(TOOLKIT_VIEWS)
 #define MAYBE_Tabs FLAKY_Tabs
 #else
 #define MAYBE_Tabs Tabs
 #endif
@@ skipping 43 matching lines @@
   ASSERT_TRUE(test_server()->Start());
   ASSERT_TRUE(RunExtensionSubtest("tabs/capture_visible_tab",
                                   "test_png.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, TabsOnUpdated) {
   ASSERT_TRUE(test_server()->Start());
 
   ASSERT_TRUE(RunExtensionTest("tabs/on_updated")) << message_;
 }