[Desktop] Add diagnostics about loading the refresh tokens.

components/signin/core/browser/signin_internals_util.h

Index: components/signin/core/browser/signin_internals_util.h
diff --git a/components/signin/core/browser/signin_internals_util.h b/components/signin/core/browser/signin_internals_util.h
index 3dda94c9af26d716902c1bf90a27e293d43f0457..03e5c6fa8dbb7438af941cab0ae2610c875b04c9 100644
--- a/components/signin/core/browser/signin_internals_util.h
+++ b/components/signin/core/browser/signin_internals_util.h
@@ -69,13 +69,7 @@ class SigninDiagnosticsObserver {
   // Credentials and signin related changes.
   virtual void NotifySigninValueChanged(const TimedSigninStatusField& field,
                                         const std::string& value) {}
-  // OAuth tokens related changes.
-  virtual void NotifyTokenReceivedSuccess(const std::string& token_name,
-                                          const std::string& token,
-                                          bool update_time) {}
-  virtual void NotifyTokenReceivedFailure(const std::string& token_name,
-                                          const std::string& error) {}
-  virtual void NotifyClearStoredToken(const std::string& token_name) {}};
+};
 
 // Gets the first 6 hex characters of the SHA256 hash of the passed in string.
 // These are enough to perform equality checks across a single users tokens,