Expose ReconcilorState. Rename MergeSession in Signin Tracker.

components/signin/core/browser/signin_tracker.h

Index: components/signin/core/browser/signin_tracker.h
diff --git a/components/signin/core/browser/signin_tracker.h b/components/signin/core/browser/signin_tracker.h
index 5f82bd001ed9db27d4ee3130c79c01a2b306e89b..6d9c7be4de375e0cd6908a82ac482f2965536b9f 100644
--- a/components/signin/core/browser/signin_tracker.h
+++ b/components/signin/core/browser/signin_tracker.h
@@ -64,7 +64,7 @@ class SigninTracker : public SigninManagerBase::Observer,
 
     // The signed in account has been added into the content area cookie jar.
     // This will be called only after a call to SigninSuccess().
-    virtual void MergeSessionComplete(const GoogleServiceAuthError& error) = 0;
+    virtual void AccountAddedToCookie(const GoogleServiceAuthError& error) = 0;
   };
 
   // Creates a SigninTracker that tracks the signin status on the passed