Migrate invalidator client IDs out of sync

sync/notifier/fake_invalidation_state_tracker.h

Index: sync/notifier/fake_invalidation_state_tracker.h
diff --git a/sync/notifier/fake_invalidation_state_tracker.h b/sync/notifier/fake_invalidation_state_tracker.h
index a3ea0bf70c826200f15fcd0110d36acaaf05aa25..79606ee32016ae72dd992c86500339a72610299d 100644
--- a/sync/notifier/fake_invalidation_state_tracker.h
+++ b/sync/notifier/fake_invalidation_state_tracker.h
@@ -27,6 +27,8 @@ class FakeInvalidationStateTracker
                                        int64 max_version,
                                        const std::string& payload) OVERRIDE;
   virtual void Forget(const ObjectIdSet& ids) OVERRIDE;
+  virtual void SetInvalidatorClientId(const std::string& client_id) OVERRIDE;
+  virtual std::string GetInvalidatorClientId() const OVERRIDE;
   virtual void SetBootstrapData(const std::string& data) OVERRIDE;
   virtual std::string GetBootstrapData() const OVERRIDE;
   virtual void GenerateAckHandles(
@@ -40,6 +42,7 @@ class FakeInvalidationStateTracker
 
  private:
   InvalidationStateMap state_map_;
+  std::string invalidator_client_id_;
   std::string bootstrap_data_;
 };