Add missing Function#bind call

Change-Id: I7a4639178455ce0fa990ae77979cc53cd5c38419
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
index f69f8b1..042e901 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface.js
@@ -104,7 +104,7 @@
         }.bind(this)).catch(function(err) {
           this._sharedFetchPromises[url] = undefined;
           throw err;
-        });
+        }.bind(this));
       return this._sharedFetchPromises[url];
     },