Test birtday error.

chrome/test/live_sync/live_sync_test.h

Index: chrome/test/live_sync/live_sync_test.h
diff --git a/chrome/test/live_sync/live_sync_test.h b/chrome/test/live_sync/live_sync_test.h
index 1946be7ca87d9ab604928e29ecc906daff768492..94d6f635bad48b1ec374a986f09da039f1b183ff 100644
--- a/chrome/test/live_sync/live_sync_test.h
+++ b/chrome/test/live_sync/live_sync_test.h
@@ -130,6 +130,10 @@ class LiveSyncTest : public InProcessBrowserTest {
   // only if ServerSupportsErrorTriggering() returned true.
   void TriggerMigrationDoneError(const syncable::ModelTypeSet& model_types);
 
+  // Triggers the server to set its birthday to a random value thereby
+  // the server would return a birthday error on next sync.
+  void TriggerBirthdayError();
+
  protected:
   // InProcessBrowserTest override. Destroys all the sync clients and sync
   // profiles created by a test.