Disable deadline file in Android.

The deadline file is used to notify chrome the deadline string sent by
the server. This message allows chrome to take a different action based
on the urgency of the update. While we would like to provide a proper
API for this mechanism, it is rarely used in Chrome OS and doesn't work
on Android, so we disable it for now.

Bug: 24868621
Test: Unittest pass. No error message when tested on a dragonboard.

Change-Id: I77fc5b55e1c6ec79f12d88be40426058b8aa4d02
diff --git a/omaha_response_handler_action_unittest.cc b/omaha_response_handler_action_unittest.cc
index c97ef9e..d103cbc 100644
--- a/omaha_response_handler_action_unittest.cc
+++ b/omaha_response_handler_action_unittest.cc
@@ -112,7 +112,7 @@
   OmahaResponseHandlerAction response_handler_action(
       &fake_system_state_,
       (test_deadline_file.empty() ?
-       OmahaResponseHandlerAction::kDeadlineFile : test_deadline_file));
+       constants::kOmahaResponseDeadlineFile : test_deadline_file));
   BondActions(&feeder_action, &response_handler_action);
   ObjectCollectorAction<InstallPlan> collector_action;
   BondActions(&response_handler_action, &collector_action);