Don't show current RenderWidgetHostView while interstitial is showing.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index 24810ed15e4d3b918dad1dcb88e9dd03f77a7d84..da2d6548129220f1e2606a4acc5efe52b070ddb0 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -156,6 +156,10 @@ class CONTENT_EXPORT RenderFrameHostManager
     virtual NavigationEntry*
         GetLastCommittedNavigationEntryForRenderManager() = 0;
 
+    // Returns the interstitial page showing in the delegate, or null if there
+    // is none.
+    virtual InterstitialPageImpl* GetInterstitialForRenderManager() = 0;
+
     // Returns true if the location bar should be focused by default rather than
     // the page contents. The view calls this function when the tab is focused
     // to see what it should do.
@@ -344,25 +348,6 @@ class CONTENT_EXPORT RenderFrameHostManager
   // SiteInstance.
   void CreateProxiesForChildFrame(FrameTreeNode* child);
 
-  // Sets the passed passed interstitial as the currently showing interstitial.
-  // |interstitial_page| should be non NULL (use the remove_interstitial_page
-  // method to unset the interstitial) and no interstitial page should be set
-  // when there is already a non NULL interstitial page set.
-  void set_interstitial_page(InterstitialPageImpl* interstitial_page) {
-    DCHECK(!interstitial_page_ && interstitial_page);
-    interstitial_page_ = interstitial_page;
-  }
-
-  // Unsets the currently showing interstitial.
-  void remove_interstitial_page() {
-    DCHECK(interstitial_page_);
-    interstitial_page_ = NULL;
-  }
-
-  // Returns the currently showing interstitial, NULL if no interstitial is
-  // showing.
-  InterstitialPageImpl* interstitial_page() const { return interstitial_page_; }
-
   // Returns the swapped out RenderViewHost for the given SiteInstance, if any.
   // This method is *deprecated* and GetRenderFrameProxyHost should be used.
   RenderViewHostImpl* GetSwappedOutRenderViewHost(SiteInstance* instance) const;
@@ -800,10 +785,6 @@ class CONTENT_EXPORT RenderFrameHostManager
   using RFHPendingDeleteList = std::list<std::unique_ptr<RenderFrameHostImpl>>;
   RFHPendingDeleteList pending_delete_hosts_;
 
-  // The intersitial page currently shown if any, not own by this class
-  // (the InterstitialPage is self-owned, it deletes itself when hidden).
-  InterstitialPageImpl* interstitial_page_;
-
   // PlzNavigate
   // Stores a speculative RenderFrameHost which is created early in a navigation
   // so a renderer process can be started in parallel, if needed.