[Offline pages] Update background loader offliner to return error when

chrome/browser/android/offline_pages/background_loader_offliner.h

Index: chrome/browser/android/offline_pages/background_loader_offliner.h
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner.h b/chrome/browser/android/offline_pages/background_loader_offliner.h
index f8c6a04cda9dccb57e64c98b0663177250a46408..0240e148d03c8de83ab838cd1b7b13edd06067de 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.h
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.h
@@ -41,6 +41,8 @@ class BackgroundLoaderOffliner : public Offliner,
 
   // WebContentsObserver implementation.
   void DidStopLoading() override;
+  void RenderProcessGone(base::TerminationStatus status) override;
+  void WebContentsDestroyed() override;
 
  protected:
   // Called to reset internal loader and observer state.