Update sync logic for voice match status

Only sync status at the first init to prevent unexpected corner cases.

Bug: 960509
Test: Manual Test
Change-Id: I5f21f9467f6ee39a722b665a08c6e16c25141dd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643610
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666545}

chromeos/services/assistant/assistant_manager_service_impl.cc

@@ -62,6 +62,8 @@ namespace chromeos {
 namespace assistant {
 namespace {
 
+static bool is_first_init = true;
+
 constexpr char kWiFiDeviceSettingId[] = "WIFI";
 constexpr char kBluetoothDeviceSettingId[] = "BLUETOOTH";
 constexpr char kVolumeLevelDeviceSettingId[] = "VOLUME_LEVEL";
@@ -995,9 +997,15 @@ void AssistantManagerServiceImpl::PostInitAssistant(
   std::move(post_init_callback).Run();
   assistant_settings_manager_->UpdateServerDeviceSettings();
 
-  if (base::FeatureList::IsEnabled(assistant::features::kAssistantVoiceMatch) &&
-      service_->assistant_state()->hotword_enabled().value()) {
-    assistant_settings_manager_->SyncSpeakerIdEnrollmentStatus();
+  if (is_first_init) {
+    is_first_init = false;
+    // Only sync status at the first init to prevent unexpected corner cases.
+    // This still does not handle browser restart.
+    if (base::FeatureList::IsEnabled(
+            assistant::features::kAssistantVoiceMatch) &&
+        service_->assistant_state()->hotword_enabled().value()) {
+      assistant_settings_manager_->SyncSpeakerIdEnrollmentStatus();
+    }
   }
 
   if (base::FeatureList::IsEnabled(assistant::features::kAssistantAppSupport)) {