Call to URLDataManagerIOS::DeleteDataSources during shutdown

ios/web/app/web_main_loop.mm

Index: ios/web/app/web_main_loop.mm
diff --git a/ios/web/app/web_main_loop.mm b/ios/web/app/web_main_loop.mm
index 05b3ee2809251ca9e524dbb1fa151f96013c5a66..be504e0df6c798b5cd100353e08a8d68075008c7 100644
--- a/ios/web/app/web_main_loop.mm
+++ b/ios/web/app/web_main_loop.mm
@@ -24,6 +24,7 @@
 #include "ios/web/public/app/web_main_parts.h"
 #include "ios/web/public/web_client.h"
 #include "ios/web/web_thread_impl.h"
+#include "ios/web/webui/url_data_manager_ios.h"
 #include "net/base/network_change_notifier.h"
 
 namespace web {
@@ -252,6 +253,8 @@ void WebMainLoop::ShutdownThreadsAndCleanUp() {
   // more head start for those operations to finish.
   WebThreadImpl::ShutdownThreadPool();
 
+  URLDataManagerIOS::DeleteDataSources();
+
   if (parts_) {
     parts_->PostDestroyThreads();
   }