Reverse true/false states of load_time_data_defaults_added_.

ios/web/webui/web_ui_ios_data_source_impl.mm

Index: ios/web/webui/web_ui_ios_data_source_impl.mm
diff --git a/ios/web/webui/web_ui_ios_data_source_impl.mm b/ios/web/webui/web_ui_ios_data_source_impl.mm
index 189722fac972e2c9eebe4512379345fc78878a54..80da6f827987621ea231f23fe4d57a1778eb930d 100644
--- a/ios/web/webui/web_ui_ios_data_source_impl.mm
+++ b/ios/web/webui/web_ui_ios_data_source_impl.mm
@@ -66,7 +66,7 @@ WebUIIOSDataSourceImpl::WebUIIOSDataSourceImpl(const std::string& source_name)
       source_name_(source_name),
       default_resource_(-1),
       deny_xframe_options_(true),
-      load_time_data_defaults_added_(true),
+      load_time_data_defaults_added_(false),
       replace_existing_source_(true) {}
 
 WebUIIOSDataSourceImpl::~WebUIIOSDataSourceImpl() {}
@@ -142,10 +142,10 @@ std::string WebUIIOSDataSourceImpl::GetMimeType(const std::string& path) const {
 }
 
 void WebUIIOSDataSourceImpl::EnsureLoadTimeDataDefaultsAdded() {
-  if (!load_time_data_defaults_added_)
+  if (load_time_data_defaults_added_)
     return;
 
-  load_time_data_defaults_added_ = false;
+  load_time_data_defaults_added_ = true;
   base::DictionaryValue defaults;
   webui::SetLoadTimeDataDefaults(web::GetWebClient()->GetApplicationLocale(),
                                  &defaults);