Remove remaining WebContentsImpl from InterstitialPageImpl.

content/browser/web_contents/interstitial_page_impl.cc

Index: content/browser/web_contents/interstitial_page_impl.cc
diff --git a/content/browser/web_contents/interstitial_page_impl.cc b/content/browser/web_contents/interstitial_page_impl.cc
index 44d28e187daae1661ccbafb1379103c83a8e9943..7819c198e0397b281400d1a13da340ec736f165b 100644
--- a/content/browser/web_contents/interstitial_page_impl.cc
+++ b/content/browser/web_contents/interstitial_page_impl.cc
@@ -21,7 +21,6 @@
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/web_contents/navigation_controller_impl.h"
 #include "content/browser/web_contents/navigation_entry_impl.h"
-#include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/view_messages.h"
 #include "content/port/browser/render_view_host_delegate_view.h"
 #include "content/port/browser/render_widget_host_view_port.h"
@@ -35,6 +34,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/storage_partition.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/bindings_policy.h"
 #include "content/public/common/page_transition_types.h"
@@ -114,17 +114,6 @@ static void InitInterstitialPageMap() {
     g_web_contents_to_interstitial_page = new InterstitialPageMap;
 }
 
-InterstitialPage* InterstitialPage::Create(WebContents* web_contents,
-                                           bool new_navigation,
-                                           const GURL& url,
-                                           InterstitialPageDelegate* delegate) {
-  return new InterstitialPageImpl(
-      web_contents,
-      static_cast<RenderWidgetHostDelegate*>(
-          static_cast<WebContentsImpl*>(web_contents)),
-      new_navigation, url, delegate);
-}
-
 InterstitialPage* InterstitialPage::GetInterstitialPage(
     WebContents* web_contents) {
   InitInterstitialPageMap();
@@ -827,12 +816,12 @@ void InterstitialPageImpl::InterstitialPageRVHDelegateView::TakeFocus(
     bool reverse) {
   if (!interstitial_page_->web_contents())
     return;
-  WebContentsImpl* web_contents =
-      static_cast<WebContentsImpl*>(interstitial_page_->web_contents());
-  if (!web_contents->GetDelegateView())
-    return;
 
-  web_contents->GetDelegateView()->TakeFocus(reverse);
+  RenderViewHostDelegateView* view =
+      interstitial_page_->GetDelegateView();
+
+  if (view)
+    view->TakeFocus(reverse);
 }
 
 void InterstitialPageImpl::InterstitialPageRVHDelegateView::OnFindReply(