Don't split off NTP subframes with TDI.

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 26a0843e0c86002f7f63fdb4766fcbc20906aefd..71cd797d0d1e8b2955dfe542e841eac325f78093 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -98,6 +98,9 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
                                 ui::PageTransition* transition,
                                 bool* is_renderer_initiated,
                                 content::Referrer* referrer) override;
+  bool ShouldFrameShareParentSiteInstanceDespiteTopDocumentIsolation(
+      const GURL& url,
+      content::SiteInstance* parent_site_instance) override;
   bool IsSuitableHost(content::RenderProcessHost* process_host,
                       const GURL& site_url) override;
   bool MayReuseHost(content::RenderProcessHost* process_host) override;