Fix ntp-tiles-internals crash in incognito mode

chrome/browser/ui/webui/ntp_tiles_internals_ui.cc

Index: chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
diff --git a/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc b/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
index 5564716a93801bf7942d5f47894192ba7d670a3e..e12782d398966b0131c69742fe8e284417da313a 100644
--- a/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
+++ b/chrome/browser/ui/webui/ntp_tiles_internals_ui.cc
@@ -42,6 +42,7 @@ class ChromeNTPTilesInternalsMessageHandlerClient
   void RegisterMessages() override;
 
   // ntp_tiles::NTPTilesInternalsMessageHandlerClient
+  bool SupportsNTPTiles() override;
   bool DoesSourceExist(ntp_tiles::NTPTileSource source) override;
   std::unique_ptr<ntp_tiles::MostVisitedSites> MakeMostVisitedSites() override;
   std::unique_ptr<ntp_tiles::PopularSites> MakePopularSites() override;
@@ -62,6 +63,11 @@ void ChromeNTPTilesInternalsMessageHandlerClient::RegisterMessages() {
   handler_.RegisterMessages(this);
 }
 
+bool ChromeNTPTilesInternalsMessageHandlerClient::SupportsNTPTiles() {
+  Profile* profile = Profile::FromWebUI(web_ui());
+  return !(profile->IsGuestSession() || profile->IsOffTheRecord());
+}
+
 bool ChromeNTPTilesInternalsMessageHandlerClient::DoesSourceExist(
     ntp_tiles::NTPTileSource source) {
   switch (source) {