Proper initialization for known_disabled.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 0eac6e0142c5644991da3e4842cf03f1427da21a..986b4f48ee94eded5e2aef9e8e920b067a6eb85e 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1432,9 +1432,8 @@ bool ExtensionService::IsUnacknowledgedExternalExtension(
 }
 
 void ExtensionService::ReconcileKnownDisabled() {
-  const ExtensionIdSet known_disabled_ids =
-      extension_prefs_->GetKnownDisabled();
-  if (known_disabled_ids.empty() && !disabled_extensions_.is_empty()) {
+  ExtensionIdSet known_disabled_ids;
+  if (!extension_prefs_->GetKnownDisabled(&known_disabled_ids)) {
     extension_prefs_->SetKnownDisabled(disabled_extensions_.GetIDs());
     UMA_HISTOGRAM_BOOLEAN("Extensions.KnownDisabledInitialized", true);
     return;