Don't split off NTP subframes with TDI.

chrome/browser/chrome_content_browser_client.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 80 matching lines @@
   bool LogWebUIUrl(const GURL& web_ui_url) const override;
   bool IsHandledURL(const GURL& url) override;
   bool CanCommitURL(content::RenderProcessHost* process_host,
                     const GURL& url) override;
   bool ShouldAllowOpenURL(content::SiteInstance* site_instance,
                           const GURL& url) override;
   void OverrideNavigationParams(content::SiteInstance* site_instance,
                                 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;
   bool ShouldTryToUseExistingProcessHost(
       content::BrowserContext* browser_context,
       const GURL& url) override;
   void SiteInstanceGotProcess(content::SiteInstance* site_instance) override;
   void SiteInstanceDeleting(content::SiteInstance* site_instance) override;
   bool ShouldSwapBrowsingInstancesForNavigation(
       content::SiteInstance* site_instance,
@@ skipping 244 matching lines @@
   // Vector of additional ChromeContentBrowserClientParts.
   // Parts are deleted in the reverse order they are added.
   std::vector<ChromeContentBrowserClientParts*> extra_parts_;
 
   base::WeakPtrFactory<ChromeContentBrowserClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentBrowserClient);
 };
 
 #endif  // CHROME_BROWSER_CHROME_CONTENT_BROWSER_CLIENT_H_