If MHTML saving is cancelled, delete the page afterwards.

chrome/browser/android/offline_pages/background_loader_offliner.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_BACKGROUND_LOADER_OFFLINER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_BACKGROUND_LOADER_OFFLINER_H_
 
 #include <memory>
 
 #include "base/android/application_status_listener.h"
@@ skipping 66 matching lines @@
   // Called when application state has changed.
   void OnApplicationStateChange(
       base::android::ApplicationState application_state);
 
   // Called to remember at what time we started loading.
   void MarkLoadStartTime();
 
   // Called to add a loading signal as we observe it.
   void AddLoadingSignal(const char* signal_name);
 
+  void DeleteOfflinePageCallback(const SavePageRequest& request,
+                                 DeletePageResult result);
+
   std::unique_ptr<background_loader::BackgroundLoaderContents> loader_;
   // Not owned.
   content::BrowserContext* browser_context_;
   // Not owned.
   OfflinePageModel* offline_page_model_;
   // Not owned.
   const OfflinerPolicy* policy_;
   // Tracks pending request, if any.
   std::unique_ptr<SavePageRequest> pending_request_;
   // Handles determining when a page should be snapshotted.
@@ skipping 29 matching lines @@
 
   // Callback for cancel.
   CancelCallback cancel_callback_;
 
   base::WeakPtrFactory<BackgroundLoaderOffliner> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(BackgroundLoaderOffliner);
 };
 
 }  // namespace offline_pages
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_BACKGROUND_LOADER_OFFLINER_H_