Don't use GetAsTabContents. Send notifications from TabContentsView instead.

chrome/browser/tab_contents/interstitial_page.cc

Index: chrome/browser/tab_contents/interstitial_page.cc
diff --git a/chrome/browser/tab_contents/interstitial_page.cc b/chrome/browser/tab_contents/interstitial_page.cc
index c41c51963ca3a8c597f8484901bf591a6ac01b94..36f900461d70dfda12bd4ba8e0d534f2e83a9937 100644
--- a/chrome/browser/tab_contents/interstitial_page.cc
+++ b/chrome/browser/tab_contents/interstitial_page.cc
@@ -92,8 +92,7 @@ class InterstitialPage::InterstitialPageRVHViewDelegate
   // RenderViewHostDelegate::View implementation:
   virtual void CreateNewWindow(
       int route_id,
-      WindowContainerType window_container_type,
-      const string16& frame_name);
+      const ViewHostMsg_CreateWindow_Params& params);
   virtual void CreateNewWidget(int route_id,
                                WebKit::WebPopupType popup_type);
   virtual void CreateNewFullscreenWidget(int route_id,
@@ -594,8 +593,7 @@ InterstitialPage::InterstitialPageRVHViewDelegate::
 
 void InterstitialPage::InterstitialPageRVHViewDelegate::CreateNewWindow(
     int route_id,
-    WindowContainerType window_container_type,
-    const string16& frame_name) {
+    const ViewHostMsg_CreateWindow_Params& params) {
   NOTREACHED() << "InterstitialPage does not support showing popups yet.";
 }