[Autotest] Updating tests with minor UI changes

Chrome dropdown is no longer considered a "button". Removing that from
the tests.

TEST=policy_PrintingEnabled, Policy_IncognitoModeAvailability
BUG=None

Change-Id: I7044f4bdfbd13f8377d21b6cc429f375cc9fe63b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1971587
Tested-by: Derek Beckett <dbeckett@chromium.org>
Reviewed-by: Ruben Zakarian <rzakarian@chromium.org>
Commit-Queue: Derek Beckett <dbeckett@chromium.org>
diff --git a/client/site_tests/policy_IncognitoModeAvailability/policy_IncognitoModeAvailability.py b/client/site_tests/policy_IncognitoModeAvailability/policy_IncognitoModeAvailability.py
index 0546ab7..cc83297 100644
--- a/client/site_tests/policy_IncognitoModeAvailability/policy_IncognitoModeAvailability.py
+++ b/client/site_tests/policy_IncognitoModeAvailability/policy_IncognitoModeAvailability.py
@@ -36,8 +36,8 @@
 
         """
         button_name = '/New incognito window/'
-        self.ui.wait_for_ui_obj('Chrome', role='button')
-        self.ui.doDefault_on_obj('Chrome', role='button')
+        self.ui.wait_for_ui_obj('Chrome')
+        self.ui.doDefault_on_obj('Chrome')
         if case == 'Available' and not self.ui.item_present(button_name,
                                                             isRegex=True):
             raise error.TestFail('Incognito not available')
diff --git a/client/site_tests/policy_PrintingEnabled/policy_PrintingEnabled.py b/client/site_tests/policy_PrintingEnabled/policy_PrintingEnabled.py
index 98bb979..3e41af8 100644
--- a/client/site_tests/policy_PrintingEnabled/policy_PrintingEnabled.py
+++ b/client/site_tests/policy_PrintingEnabled/policy_PrintingEnabled.py
@@ -20,7 +20,7 @@
         @param case: bool or None, the setting of the PrintingEnabled Policy
 
         """
-        self.ui.doDefault_on_obj('Chrome', role='button')
+        self.ui.doDefault_on_obj('Chrome')
         self.ui.wait_for_ui_obj('/Print/', role='menuItem', isRegex=True)
         print_disabled = self.ui.is_obj_restricted('/Print/',
                                                    role='menuItem',