Remove obsolete flag

Bug: b/146869452
Test: Manual Test
Change-Id: I1793ff6d403341f9f93377bb03e2a198dec7f25e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050682Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740845}

chrome/browser/resources/settings/chromeos/google_assistant_page/google_assistant_browser_proxy.js

@@ -34,9 +34,7 @@ cr.define('settings', function() {
 
     /** @override */
     syncVoiceModelStatus() {
-      if (loadTimeData.getBoolean('voiceMatchEnabled')) {
-        chrome.send('syncVoiceModelStatus');
-      }
+      chrome.send('syncVoiceModelStatus');
     }
   }