Fix a crash on showing sync setup dialog in guest mode.

chrome/browser/ui/webui/sync_setup_handler_unittest.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 "chrome/browser/ui/webui/sync_setup_handler.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/json/json_writer.h"
@@ skipping 424 matching lines @@
   const TestWebUI::CallData& data = web_ui_.call_data()[0];
   EXPECT_EQ("SyncSetupOverlay.showSyncSetupPage", data.function_name);
 
   ASSERT_FALSE(handler_->is_configuring_sync());
   EXPECT_EQ(NULL,
             LoginUIServiceFactory::GetForProfile(
                 profile_.get())->current_login_ui());
 }
 #endif  // !defined(OS_CHROMEOS)
 
+// Verifies that the sync setup is terminated correctly when the
+// sync is disabled.
+TEST_F(SyncSetupHandlerTest, HandleSetupUIWhenSyncDisabled) {
+  EXPECT_CALL(*mock_pss_, IsManaged()).WillRepeatedly(Return(true));
+  handler_->HandleShowSetupUI(NULL);
+
+  // Sync setup is closed when sync is disabled.
+  EXPECT_EQ(NULL,
+            LoginUIServiceFactory::GetForProfile(
+                profile_.get())->current_login_ui());
+  ASSERT_FALSE(handler_->is_configuring_sync());
+}
+
 // Verifies that the handler correctly handles a cancellation when
 // it is displaying the spinner to the user.
 TEST_F(SyncSetupHandlerTest, DisplayConfigureWithBackendDisabledAndCancel) {
   EXPECT_CALL(*mock_pss_, IsSyncEnabledAndLoggedIn())
       .WillRepeatedly(Return(true));
   EXPECT_CALL(*mock_pss_, IsOAuthRefreshTokenAvailable())
       .WillRepeatedly(Return(true));
   EXPECT_CALL(*mock_pss_, HasSyncSetupCompleted())
       .WillRepeatedly(Return(false));
   error_ = GoogleServiceAuthError::AuthErrorNone();
@@ skipping 585 matching lines @@
 
   // This should display the sync setup dialog (not login).
   handler_->OpenSyncSetup();
 
   ExpectConfig();
   const TestWebUI::CallData& data = web_ui_.call_data()[0];
   base::DictionaryValue* dictionary;
   ASSERT_TRUE(data.arg2->GetAsDictionary(&dictionary));
   CheckBool(dictionary, "encryptAllData", true);
 }