Remove frontend redirection of legacy URIs without project

Redirection of URIs with change number only is happening in the
backend.
Furthermore, since I622c4849 the mackend is handling URIs
with and without the `/c/` prefix in the path.

The frontend doesn't need anymore redirection logic.

Bug: Issue 305565066
Release-Notes: skip
Change-Id: I4ccff23305578e407390643c6c3a7bfa1950d9e1

polygerrit-ui/app/elements/core/gr-router/gr-router.ts

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 ac35264..e0d4185 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -196,10 +196,6 @@
 
   CHANGE_ID_QUERY: /^\/id\/(I[0-9a-f]{40})$/,
 
-  // Matches /c/<changeNum>/[*][/].
-  CHANGE_LEGACY: /^\/c\/(\d+)\/?(.*)$/,
-  CHANGE_NUMBER_LEGACY: /^\/(\d+)\/?/,
-
   // Matches
   // /c/<project>/+/<changeNum>/[<basePatchNum|edit>..][<patchNum|edit>].
   // TODO(kaspern): Migrate completely to project based URLs, with backwards
@@ -849,12 +845,6 @@
     );
 
     this.mapRoute(
-      RoutePattern.CHANGE_NUMBER_LEGACY,
-      'handleChangeNumberLegacyRoute',
-      ctx => this.handleChangeNumberLegacyRoute(ctx)
-    );
-
-    this.mapRoute(
       RoutePattern.DIFF_EDIT,
       'handleDiffEditRoute',
       ctx => this.handleDiffEditRoute(ctx),
@@ -884,10 +874,6 @@
       this.handleChangeRoute(ctx)
     );
 
-    this.mapRoute(RoutePattern.CHANGE_LEGACY, 'handleChangeLegacyRoute', ctx =>
-      this.handleChangeLegacyRoute(ctx)
-    );
-
     this.mapRoute(
       RoutePattern.AGREEMENTS,
       'handleAgreementsRoute',
@@ -1305,14 +1291,6 @@
     this.redirect(ctx.path.replace(LEGACY_QUERY_SUFFIX_PATTERN, ''));
   }
 
-  handleChangeNumberLegacyRoute(ctx: PageContext) {
-    this.redirect(
-      '/c/' +
-        ctx.params[0] +
-        (ctx.querystring.length > 0 ? `?${ctx.querystring}` : '')
-    );
-  }
-
   handleChangeRoute(ctx: PageContext) {
     // Parameter order is based on the regex group number matched.
     const changeNum = Number(ctx.params[1]) as NumericChangeId;
@@ -1464,26 +1442,6 @@
     this.changeViewModel.setState(state);
   }
 
-  handleChangeLegacyRoute(ctx: PageContext) {
-    const changeNum = Number(ctx.params[0]) as NumericChangeId;
-    if (!changeNum) {
-      this.show404();
-      return;
-    }
-    this.restApiService.getFromProjectLookup(changeNum).then(project => {
-      // Show a 404 and terminate if the lookup request failed. Attempting
-      // to redirect after failing to get the project loops infinitely.
-      if (!project) {
-        this.show404();
-        return;
-      }
-      this.redirect(
-        `/c/${project}/+/${changeNum}/${ctx.params[1]}` +
-          (ctx.querystring.length > 0 ? `?${ctx.querystring}` : '')
-      );
-    });
-  }
-
   handleLegacyLinenum(ctx: PageContext) {
     this.redirect(ctx.path.replace(LEGACY_LINENUM_PATTERN, '#$1'));
   }

polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts

diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
index 234bf95..c4fb259 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
@@ -168,13 +168,11 @@
     const unauthenticatedHandlers = [
       'handleBranchListRoute',
       'handleChangeIdQueryRoute',
-      'handleChangeNumberLegacyRoute',
       'handleChangeRoute',
       'handleCommentRoute',
       'handleCommentsRoute',
       'handleDiffRoute',
       'handleDefaultRoute',
-      'handleChangeLegacyRoute',
       'handleDocumentationRedirectRoute',
       'handleDocumentationSearchRoute',
       'handleDocumentationSearchRedirectRoute',
@@ -853,21 +851,6 @@
     });
 
     suite('CHANGE* / DIFF*', () => {
-      test('CHANGE_NUMBER_LEGACY', async () => {
-        // CHANGE_NUMBER_LEGACY: /^\/(\d+)\/?/,
-        await checkRedirect('/12345', '/c/12345');
-      });
-
-      test('CHANGE_LEGACY', async () => {
-        // CHANGE_LEGACY: /^\/c\/(\d+)\/?(.*)$/,
-        stubRestApi('getFromProjectLookup').resolves('project' as RepoName);
-        await checkRedirect('/c/1234', '/c/project/+/1234/');
-        await checkRedirect(
-          '/c/1234/comment/6789',
-          '/c/project/+/1234/comment/6789'
-        );
-      });
-
       test('DIFF_LEGACY_LINENUM', async () => {
         await checkRedirect(
           '/c/1234/3..8/foo/bar@321',