chromeos: disables WizardControllerOobeConfigurationTest.ConfigurationIsLoaded

as it is flaky

BUG=904841
TEST=test only change
TBR=antrim@chromium.org

Change-Id: If14a89ef3e6488867860601b9191e55381245547
Reviewed-on: https://chromium-review.googlesource.com/c/1333757Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607611}

chrome/browser/chromeos/login/wizard_controller_browsertest.cc

@@ -2640,8 +2640,9 @@ class WizardControllerOobeConfigurationTest : public WizardControllerTest {
   DISALLOW_COPY_AND_ASSIGN(WizardControllerOobeConfigurationTest);
 };
 
+// TODO: fix, test is flaky. https://crbug.com/904841.
 IN_PROC_BROWSER_TEST_F(WizardControllerOobeConfigurationTest,
-                       ConfigurationIsLoaded) {
+                       DISABLED_ConfigurationIsLoaded) {
   WaitForConfigurationLoaded();
   EXPECT_CALL(*mock_welcome_screen_, Show()).Times(1);
   EXPECT_CALL(*mock_welcome_screen_,