Move ClosePage() from RenderViewHost to WebContents.

chrome/browser/ui/unload_controller.cc

Index: chrome/browser/ui/unload_controller.cc
diff --git a/chrome/browser/ui/unload_controller.cc b/chrome/browser/ui/unload_controller.cc
index 8791f7056ebab71a2aa608d4d66f070b0be60a79..96a39297e62a150ceea90df9acf64ea47091e696 100644
--- a/chrome/browser/ui/unload_controller.cc
+++ b/chrome/browser/ui/unload_controller.cc
@@ -320,7 +320,7 @@ void UnloadController::ProcessPendingTabs() {
     // Null check render_view_host here as this gets called on a PostTask and
     // the tab's render_view_host may have been nulled out.
     if (web_contents->GetRenderViewHost()) {
-      web_contents->GetRenderViewHost()->ClosePage();
+      web_contents->ClosePage();
     } else {
       ClearUnloadState(web_contents, true);
     }