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

chrome/browser/android/offline_pages/prerendering_loader.h

Index: chrome/browser/android/offline_pages/prerendering_loader.h
diff --git a/chrome/browser/android/offline_pages/prerendering_loader.h b/chrome/browser/android/offline_pages/prerendering_loader.h
index 027002e2a0bba096ee593c7d706d1c259170d332..df541103861981443ec90739bcb7acbced0e423a 100644
--- a/chrome/browser/android/offline_pages/prerendering_loader.h
+++ b/chrome/browser/android/offline_pages/prerendering_loader.h
@@ -53,10 +53,6 @@ class PrerenderingLoader : public PrerenderAdapter::Observer,
   // prerenders when Chrome is transitioned to foreground.
   virtual void StopLoading();
 
-  // Returns whether prerendering is possible for this device's configuration
-  // and the browser context.
-  virtual bool CanPrerender();
-
   // Returns whether the loader is idle and able to accept new LoadPage
   // request.
   virtual bool IsIdle();