os_languages_page: Do not poll language packs if flag is disabled

The polling is not useful when the language packs in settings flag is
disabled. Disabling the poll will reduce the number of extension API
requests made.

loadTimeData is not expected to change throughout the duration of a
<settings-languages> element.

Bug: b:298128915
Change-Id: I07fca4f7b42ee744f0eb4cd2919613142296aabe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4941330
Reviewed-by: Claudio M <claudiomagni@chromium.org>
Commit-Queue: Michael Cui <mlcui@google.com>
Cr-Commit-Position: refs/heads/main@{#1209952}

chrome/browser/resources/ash/settings/os_languages_page/languages.ts

@@ -18,6 +18,7 @@ import 'chrome://resources/cr_components/settings_prefs/prefs.js';
 import {PrefsMixin} from 'chrome://resources/cr_components/settings_prefs/prefs_mixin.js';
 import {CrSettingsPrefs} from 'chrome://resources/cr_components/settings_prefs/prefs_types.js';
 import {assert} from 'chrome://resources/js/assert.js';
+import {loadTimeData} from 'chrome://resources/js/load_time_data.js';
 import {PromiseResolver} from 'chrome://resources/js/promise_resolver.js';
 import {PolymerElement} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';
 
@@ -329,12 +330,14 @@ export class SettingsLanguagesElement extends SettingsLanguagesElementBase
       this.languageSettingsPrivate_.getSpellcheckDictionaryStatuses().then(
           this.boundOnSpellcheckDictionariesChanged_);
 
-      // Poll language packs now to prevent test flakiness.
-      // Do so in the next microtask to prevent `connectedCallback()` from
-      // failing and stalling tests.
-      Promise.resolve().then(() => this.pollLanguagePacks_());
-      this.languagePackPollIntervalId = setInterval(
-          () => this.pollLanguagePacks_(), LANGUAGE_PACKS_POLLING_RATE_MS);
+      if (loadTimeData.getBoolean('languagePacksInSettingsEnabled')) {
+        // Poll language packs now to prevent test flakiness.
+        // Do so in the next microtask to prevent `connectedCallback()` from
+        // failing and stalling tests.
+        Promise.resolve().then(() => this.pollLanguagePacks_());
+        this.languagePackPollIntervalId = setInterval(
+            () => this.pollLanguagePacks_(), LANGUAGE_PACKS_POLLING_RATE_MS);
+      }
 
       this.resolver_.resolve(undefined);
     });