[OfflinePages] Improve visiblity/handling of "Loading not started" case

chrome/browser/android/offline_pages/prerender_adapter.h

Index: chrome/browser/android/offline_pages/prerender_adapter.h
diff --git a/chrome/browser/android/offline_pages/prerender_adapter.h b/chrome/browser/android/offline_pages/prerender_adapter.h
index bb5f0a78e4db6ec6c4e24aad9c8c23b9eef6c25a..ca378d74d23aa418db7ef9ae8f308d78309c35dd 100644
--- a/chrome/browser/android/offline_pages/prerender_adapter.h
+++ b/chrome/browser/android/offline_pages/prerender_adapter.h
@@ -48,9 +48,6 @@ class PrerenderAdapter : public prerender::PrerenderHandle::Observer {
   explicit PrerenderAdapter(PrerenderAdapter::Observer* observer);
   ~PrerenderAdapter() override;
 
-  // Returns whether prerendering is enabled and configured.
-  virtual bool CanPrerender() const;
-
   // Starts prerendering |url| for offlining. There must be no active
   // prerender request when calling this. Returns whether it was able
   // to start the prerendering operation.