Small lint fix

Change-Id: I02a5bf40433428db1da0882571fb43b90e216e22
diff --git a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
index 98ba237..3b81f46 100644
--- a/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-tooltip-content/gr-tooltip-content_test.js
@@ -26,10 +26,14 @@
   function makeTooltip(tooltipRect, parentRect) {
     return {
       arrowCenterOffset: '0',
-      getBoundingClientRect() { return tooltipRect; },
+      getBoundingClientRect() {
+        return tooltipRect;
+      },
       style: {left: 0, top: 0},
       parentElement: {
-        getBoundingClientRect() { return parentRect; },
+        getBoundingClientRect() {
+          return parentRect;
+        },
       },
     };
   }