Reduce dependency of TiclInvalidationService on Profile

sync/notifier/invalidation_state_tracker.h

Index: sync/notifier/invalidation_state_tracker.h
diff --git a/sync/notifier/invalidation_state_tracker.h b/sync/notifier/invalidation_state_tracker.h
index 81a07eae5c51555792a4b42c7c9d04272cdb3aff..36943d55b0c35029f418f192964f9d7d2d84dbe8 100644
--- a/sync/notifier/invalidation_state_tracker.h
+++ b/sync/notifier/invalidation_state_tracker.h
@@ -33,11 +33,13 @@ namespace syncer {
 class InvalidationStateTracker {
  public:
   InvalidationStateTracker() {}
+  virtual ~InvalidationStateTracker() {}
 
   // The per-client unique ID used to register the invalidation client with the
   // server.  This is used to squelch invalidation notifications that originate
-  // from changes made by this client.
-  virtual void SetInvalidatorClientId(const std::string& data) = 0;
+  // from changes made by this client.  Setting the client ID clears all other
+  // state.
+  virtual void ClearAndSetNewClientId(const std::string& data) = 0;
   virtual std::string GetInvalidatorClientId() const = 0;
 
   // Used by invalidation::InvalidationClient for persistence. |data| is an
@@ -55,9 +57,6 @@ class InvalidationStateTracker {
 
   // Erases invalidation versions, client ID, and state stored on disk.
   virtual void Clear() = 0;
-
- protected:
-  virtual ~InvalidationStateTracker() {}
 };
 
 }  // namespace syncer