Server directed error handling backend code.

chrome/test/sync/engine/syncer_command_test.h

Index: chrome/test/sync/engine/syncer_command_test.h
diff --git a/chrome/test/sync/engine/syncer_command_test.h b/chrome/test/sync/engine/syncer_command_test.h
index a5a8235831a71b00e656ef301ecb18a101adc799..53dc6fd052ff342031dd76163bd7f938b117d3e4 100644
--- a/chrome/test/sync/engine/syncer_command_test.h
+++ b/chrome/test/sync/engine/syncer_command_test.h
@@ -54,7 +54,11 @@ class SyncerCommandTestWithParam : public testing::TestWithParam<T>,
     FAIL() << "Should not get sessions commit delay.";
   }
   virtual void OnShouldStopSyncingPermanently() OVERRIDE {
-    FAIL() << "Shouldn't be forced to stop syncing.";
+    FAIL() << "Shouldn't be called.";
+  }
+  virtual void OnSyncProtocolError(
+      const sessions::SyncSessionSnapshot& session) OVERRIDE {
+    FAIL() << "Shouldn't be called.";
   }
 
   // ModelSafeWorkerRegistrar implementation.