gr-router: Fix renaming of app id to pg-app

In Ice695c47c8 the id of grp-app element was changed from "app" to
"pg-app" but one place was missed to be renamed.

To avoid proliferation of pg-app id across the code base, replace lookup
done by getElementById with lookup done by querySelector with gr-app
element.

Bug: Issue 15686
Change-Id: I4fbf7ecc2644567919672bd91a1de506797408c9
Release-Notes: skip

1 files changed, 3 insertions, 3 deletions

diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index 7f89fc3720..63478476db 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -262,7 +262,7 @@ const LEGACY_QUERY_SUFFIX_PATTERN = /,n,z$/;
 const REPO_TOKEN_PATTERN = /\${(project|repo)}/g;
 
 // Polymer makes `app` intrinsically defined on the window by virtue of the
-// custom element having the id "app", but it is made explicit here.
+// custom element having the id "pg-app", but it is made explicit here.
 // If you move this code to other place, please update comment about
 // gr-router and gr-app in the PolyGerritIndexHtml.soy file if needed
 const app = document.querySelector('gr-app');
@@ -332,11 +332,11 @@ export class GrRouter extends PolymerElement {
     // explicitly in app, or by delegating to it.
 
     // It is expected that application has a GrAppElement(id=='app-element')
-    // at the document level or inside the shadow root of the GrApp (id='app')
+    // at the document level or inside the shadow root of the GrApp ('gr-app')
     // element.
     return (document.getElementById('app-element') ||
       document
-        .getElementById('app')!
+        .querySelector('gr-app')!
         .shadowRoot!.getElementById('app-element')!) as AppElement;
   }