Remove usage of FOR_EACH_OBSERVER macro in google_apis

google_apis/drive/auth_service.cc

Index: google_apis/drive/auth_service.cc
diff --git a/google_apis/drive/auth_service.cc b/google_apis/drive/auth_service.cc
index c14f32ea60ed9e8d481d125ccad28a8c60798f0c..cfa54fa3f48b4cf0d13cd8274f3e4bbbe2f90164 100644
--- a/google_apis/drive/auth_service.cc
+++ b/google_apis/drive/auth_service.cc
@@ -226,9 +226,8 @@ void AuthService::OnHandleRefreshToken(bool has_refresh_token) {
   access_token_.clear();
   has_refresh_token_ = has_refresh_token;
 
-  FOR_EACH_OBSERVER(AuthServiceObserver,
-                    observers_,
-                    OnOAuth2RefreshTokenChanged());
+  for (auto& observer : observers_)
+    observer.OnOAuth2RefreshTokenChanged();
 }
 
 }  // namespace google_apis