[Offline pages] Fix crashing snapshot controller and reorganize reset code for easier test maintena…

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 ff4b745a6c26337b69358e0914fa1b5fa4ef27cc..705eda293d00244cf901f64ed94c2dfcf91f90c0 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.h
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.h
@@ -72,6 +72,8 @@ class BackgroundLoaderOffliner : public Offliner,
   enum SaveState { NONE, SAVING, DELETE_AFTER_SAVE };
   enum PageLoadState { SUCCESS, RETRIABLE, NONRETRIABLE, DELAY_RETRY };
 
+  void ResetState();
+
   // Called when the page has been saved.
   void OnPageSaved(SavePageResult save_result, int64_t offline_id);