Delete flaky help_app_ui test

The other search tests in help_app_guest_ui_browsertest should have
enough coverage, and they have a wait at the start.

Bug: b/173040661
Change-Id: I74f31b8eeaadcee4b062b9142250a0d4fe31799a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532162
Commit-Queue: Zufeng Wang <zufeng@google.com>
Reviewed-by: Rachel Carpenter <carpenterr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826648}

chromeos/components/help_app_ui/test/help_app_ui_browsertest.js

@@ -70,18 +70,6 @@ TEST_F('HelpAppUIBrowserTest', 'HasTitleAndLang', () => {
   testDone();
 });
 
-// Tests that we can make calls to the LSS to search.
-TEST_F('HelpAppUIBrowserTest', 'CanSearchViaLSSIndex', async () => {
-  const toString16 = s => ({data: Array.from(s, c => c.charCodeAt())});
-  const result = await indexRemote.find(toString16('search string!'), 100);
-
-  // Status 3 corresponds to kEmptyIndex.
-  // https://source.chromium.org/chromium/chromium/src/+/master:chromeos/components/local_search_service/mojom/types.mojom;drc=c2c84a5ac7711dedcc0b7ff9e79bf7f2da019537;l=72
-  assertEquals(result.status, 3);
-  assertEquals(result.results, null);
-  testDone();
-});
-
 // Test cases injected into the guest context.
 // See implementations in help_app_guest_ui_browsertest.js.