Move ClosePage() from RenderViewHost to WebContents.

chromecast/browser/android/cast_window_android.cc

Index: chromecast/browser/android/cast_window_android.cc
diff --git a/chromecast/browser/android/cast_window_android.cc b/chromecast/browser/android/cast_window_android.cc
index 1fe64a879aee6361a395e4a9964935957fe00c90..7c2e3547b308203429218eb7755cf2ec2eb5bdfe 100644
--- a/chromecast/browser/android/cast_window_android.cc
+++ b/chromecast/browser/android/cast_window_android.cc
@@ -86,7 +86,7 @@ void CastWindowAndroid::Close() {
   // Close page first, which fires the window.unload event. The WebContents
   // itself will be destroyed after browser-process has received renderer
   // notification that the page is closed.
-  web_contents_->GetRenderViewHost()->ClosePage();
+  web_contents_->ClosePage();
 }
 
 void CastWindowAndroid::Destroy() {