Convert MdSettingsUI to use the new navigation callbacks.

chrome/browser/ui/webui/settings/md_settings_ui.cc

Index: chrome/browser/ui/webui/settings/md_settings_ui.cc
diff --git a/chrome/browser/ui/webui/settings/md_settings_ui.cc b/chrome/browser/ui/webui/settings/md_settings_ui.cc
index 910ca3bc68df03d4e643bdd600e82e9953106d0e..0e2f1e821136448af889d8cf5df2d802c16b7f4e 100644
--- a/chrome/browser/ui/webui/settings/md_settings_ui.cc
+++ b/chrome/browser/ui/webui/settings/md_settings_ui.cc
@@ -38,6 +38,7 @@
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/settings_resources.h"
 #include "chrome/grit/settings_resources_map.h"
+#include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
@@ -202,10 +203,11 @@ void MdSettingsUI::AddSettingsPageUIHandler(
   web_ui()->AddMessageHandler(std::move(handler));
 }
 
-void MdSettingsUI::DidStartProvisionalLoadForFrame(
-    content::RenderFrameHost* render_frame_host,
-    const GURL& validated_url,
-    bool is_error_page) {
+void MdSettingsUI::DidStartNavigation(
+    content::NavigationHandle* navigation_handle) {
+  if (navigation_handle->IsSamePage())
+    return;
+
   load_start_time_ = base::Time::Now();
 }