[cros,rlz] Financial ping livelock fix and proper shutdown.

rlz/lib/rlz_lib.h

Index: rlz/lib/rlz_lib.h
diff --git a/rlz/lib/rlz_lib.h b/rlz/lib/rlz_lib.h
index a8407419a9b26a6deb4236cc3fa586f12cdaa4a4..956fc9e63f361d22dcaf85aff5b8f55bda791be1 100644
--- a/rlz/lib/rlz_lib.h
+++ b/rlz/lib/rlz_lib.h
@@ -81,6 +81,9 @@ bool RLZ_LIB_API SetURLRequestContext(net::URLRequestContextGetter* context);
 // Set the MessageLoopProxy used by RLZ store to run I/O tasks on. Should be
 // called before any other API calls.
 void RLZ_LIB_API SetIOTaskRunner(base::SequencedTaskRunner* io_task_runner);
+
+// Must be invoked during shutdown to finish any remaining tasks.
+void RLZ_LIB_API CleanupRlz();
 #endif
 
 // RLZ storage functions.