MD History: update (instead of re-create) data sources on sign in change

content/browser/webui/web_ui_data_source_impl.cc

Index: content/browser/webui/web_ui_data_source_impl.cc
diff --git a/content/browser/webui/web_ui_data_source_impl.cc b/content/browser/webui/web_ui_data_source_impl.cc
index a5364fbf2b2810e36be883d8a3bb4c7fc156ca31..c970c2009353dc77722f7969f397cd3ce86cf550 100644
--- a/content/browser/webui/web_ui_data_source_impl.cc
+++ b/content/browser/webui/web_ui_data_source_impl.cc
@@ -35,6 +35,14 @@ void WebUIDataSource::Add(BrowserContext* browser_context,
   URLDataManager::AddWebUIDataSource(browser_context, source);
 }
 
+// static
+void WebUIDataSource::Update(BrowserContext* browser_context,
+                             const std::string& source_name,
+                             std::unique_ptr<base::DictionaryValue> update) {
+  URLDataManager::UpdateWebUIDataSource(browser_context, source_name,
+                                        std::move(update));
+}
+
 // Internal class to hide the fact that WebUIDataSourceImpl implements
 // URLDataSource.
 class WebUIDataSourceImpl::InternalDataSource : public URLDataSource {
@@ -176,6 +184,10 @@ void WebUIDataSourceImpl::ExcludePathFromGzip(const std::string& path) {
   excluded_paths_.insert(path);
 }
 
+bool WebUIDataSourceImpl::IsWebUIDataSourceImpl() const {
+  return true;
+}
+
 void WebUIDataSourceImpl::DisableContentSecurityPolicy() {
   add_csp_ = false;
 }