Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/.

chrome/browser/do_not_track_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/prefs/pref_service.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
-#include "chrome/browser/prefs/pref_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/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 
 typedef InProcessBrowserTest DoNotTrackTest;
@@ skipping 57 matching lines @@
   // renderer.
   prefs->SetBoolean(prefs::kEnableDoNotTrack, false);
 
   EXPECT_TRUE(content::ExecuteScriptAndExtractString(
       browser()->tab_strip_model()->GetActiveWebContents(),
       "window.domAutomationController.send("
       "    navigator.doNotTrack === null ? '0' : '1')",
       &do_not_track));
   EXPECT_EQ("0", do_not_track);
 }