Make customization documents singletons.

chrome/browser/chromeos/login/existing_user_controller_browsertest.cc

Index: chrome/browser/chromeos/login/existing_user_controller_browsertest.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller_browsertest.cc b/chrome/browser/chromeos/login/existing_user_controller_browsertest.cc
index 1c00487528ec04af576002d0644d0ea4658898e6..0b2a25f388e53761d505ff279d17d1d5a9e081db 100644
--- a/chrome/browser/chromeos/login/existing_user_controller_browsertest.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller_browsertest.cc
@@ -65,8 +65,7 @@ class MockLoginDisplayHost : public LoginDisplayHost {
   MOCK_METHOD1(SetStatusAreaEnabled, void(bool));
   MOCK_METHOD1(SetStatusAreaVisible, void(bool));
   MOCK_METHOD0(ShowBackground, void(void));
-  MOCK_METHOD3(StartWizard, void(const std::string&,
-                                 const chromeos::StartupCustomizationDocument*,
+  MOCK_METHOD2(StartWizard, void(const std::string&,
                                  const GURL&));
   MOCK_METHOD0(StartSignInScreen, void(void));
 
@@ -186,7 +185,6 @@ IN_PROC_BROWSER_TEST_F(ExistingUserControllerTest, NewUserLogin) {
       .Times(1);
   EXPECT_CALL(*mock_login_display_host_,
               StartWizard(WizardController::kUserImageScreenName,
-                          NULL,
                           GURL()))
       .Times(1);
   EXPECT_CALL(*mock_login_display_, OnFadeOut())