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

chrome/browser/ui/panels/panel_browsertest.cc

Index: chrome/browser/ui/panels/panel_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_browsertest.cc b/chrome/browser/ui/panels/panel_browsertest.cc
index 69a3486b89279754eb57f454221f03c470ab4e13..32e7bbf9c2c4f6be2fa998920700c5c1fecaca39 100644
--- a/chrome/browser/ui/panels/panel_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_browsertest.cc
@@ -3,13 +3,13 @@
 // found in the LICENSE file.
 
 #include "base/bind.h"
+#include "base/prefs/pref_service.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/devtools/devtools_window.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/net/url_request_mock_util.h"
 #include "chrome/browser/prefs/browser_prefs.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
 #include "chrome/browser/ui/app_modal_dialogs/native_app_modal_dialog.h"