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

chrome/browser/ui/webui/sync_setup_handler_unittest.cc

Index: chrome/browser/ui/webui/sync_setup_handler_unittest.cc
diff --git a/chrome/browser/ui/webui/sync_setup_handler_unittest.cc b/chrome/browser/ui/webui/sync_setup_handler_unittest.cc
index 49f0b8297005a83bae85cff361bbdc61e6c66dcf..625680993935a493e8ba276aeff433c75ba9bfe2 100644
--- a/chrome/browser/ui/webui/sync_setup_handler_unittest.cc
+++ b/chrome/browser/ui/webui/sync_setup_handler_unittest.cc
@@ -442,6 +442,19 @@ TEST_F(SyncSetupHandlerTest, ShowSyncSetupWhenNotSignedIn) {
 }
 #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) {