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 6e088ab0671fb385e595307444cb084b345272ed..0888fd4ba7ada463068e245f163cfc1c77c946bf 100644
--- a/chrome/test/live_sync/live_sync_test.h
+++ b/chrome/test/live_sync/live_sync_test.h
@@ -138,6 +138,10 @@ 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.