bluetooth: fix error message for "Failed to register advertisement"

The error message generated when registering more advertisements
than allowed has been changed in bluez 5.44. This patch fixed the
error message.

BUG=chromium:714548
TEST=run the advertising test cases
(cros) $ test_that "${DUT_IP}" bluetooth_AdapterLEAdvertising.single
(cros) $ test_that "${DUT_IP}" bluetooth_AdapterLEAdvertising.multiple

Change-Id: Ie10c78f9f434c56b822809352a59222430ae75af
Reviewed-on: https://chromium-review.googlesource.com/485541
Commit-Ready: Shyh-In Hwang <josephsih@chromium.org>
Tested-by: Shyh-In Hwang <josephsih@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
diff --git a/server/cros/bluetooth/bluetooth_adapter_tests.py b/server/cros/bluetooth/bluetooth_adapter_tests.py
index 36b6869..44afd30 100644
--- a/server/cros/bluetooth/bluetooth_adapter_tests.py
+++ b/server/cros/bluetooth/bluetooth_adapter_tests.py
@@ -403,8 +403,8 @@
     ADVERTISING_INTERVAL_UNIT = 0.625
 
     # Error messages about advertising dbus methods.
-    ERROR_MAX_ADVERTISEMENTS = (
-            'org.bluez.Error.Failed: Maximum advertisements reached')
+    ERROR_FAILED_TO_REGISTER_ADVERTISEMENT = (
+            'org.bluez.Error.Failed: Failed to register advertisement')
     ERROR_INVALID_ADVERTISING_INTERVALS = (
             'org.bluez.Error.InvalidArguments: Invalid arguments')
 
@@ -1366,9 +1366,10 @@
                         advertisement_data),
                 logging_timespan=logging_timespan)
 
-        # Verify that max advertisements are reached.
-        max_advertisements_error = (
-                self.ERROR_MAX_ADVERTISEMENTS in self.advertising_msg)
+        # Verify that it failed to register advertisement due to the fact
+        # that max advertisements are reached.
+        failed_to_register_error = (self.ERROR_FAILED_TO_REGISTER_ADVERTISEMENT
+                                    in self.advertising_msg)
 
         # Verify that no new advertisement is added.
         advertisement_not_added = not self.bluetooth_le_facade.btmon_find(
@@ -1384,7 +1385,7 @@
                 'Advertising: Enabled (0x01)')
 
         self.results = {
-                'max_advertisements_error': max_advertisements_error,
+                'failed_to_register_error': failed_to_register_error,
                 'advertisement_not_added': advertisement_not_added,
                 'min_adv_interval_ms_found': min_adv_interval_ms_found,
                 'max_adv_interval_ms_found': max_adv_interval_ms_found,