PART1: Initiated the SignedSettings refactoring.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index ae096085974154ff3bfbe10f794c174cf1366481..30f1707d4a883daf94b73ab6a77373e4c39b0223 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -11,12 +11,12 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/io_thread.h"
+#include "chrome/browser/chromeos/cros_settings.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/power_library.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
 #include "chrome/browser/chromeos/login/webui_login_display.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/chromeos/user_cros_settings_provider.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/net/gaia/gaia_urls.h"
@@ -264,10 +264,12 @@ void SigninScreenHandler::ShowSigninScreenIfReady() {
   if (!app_locale.empty())
     params.SetString("hl", app_locale);
 
-  params.SetBoolean("createAccount",
-      UserCrosSettingsProvider::cached_allow_new_user());
-  params.SetBoolean("guestSignin",
-      UserCrosSettingsProvider::cached_allow_guest());
+  bool allow_new_user;
+  CrosSettings::Get()->GetBoolean(kAccountsPrefAllowNewUser, &allow_new_user);
+  params.SetBoolean("createAccount", allow_new_user);
+  bool allow_guest;
+  CrosSettings::Get()->GetBoolean(kAccountsPrefAllowGuest, &allow_guest);
+  params.SetBoolean("guestSignin", allow_guest);
   params.SetString("gaiaOrigin", GaiaUrls::GetInstance()->gaia_origin_url());
 
   // Test automation data:
@@ -385,7 +387,9 @@ void SigninScreenHandler::SendUserList(bool animated) {
   for (UserVector::const_iterator it = users.begin();
        it != users.end(); ++it) {
     const std::string& email = it->email();
-    bool is_owner = email == UserCrosSettingsProvider::cached_owner();
+    std::string owner;
+    chromeos::CrosSettings::Get()->GetString(chromeos::kDeviceOwner, &owner);
+    bool is_owner = email == owner;
 
     if (non_owner_count < max_non_owner_users || is_owner) {
       DictionaryValue* user_dict = new DictionaryValue();