[Downloads] Handle externally deleted items

chrome/browser/android/download/download_manager_service.h

 // Copyright 2015 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_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_
 
 #include <jni.h>
 #include <map>
 #include <string>
@@ skipping 55 matching lines @@
                       jobject obj,
                       const JavaParamRef<jstring>& jdownload_guid,
                       bool is_off_the_record);
 
   // Called to request that the DownloadManagerService return data about all
   // downloads in the user's history.
   void GetAllDownloads(JNIEnv* env,
                        const JavaParamRef<jobject>& obj,
                        bool is_off_the_record);
 
+  // Called to check if the files associated with any downloads have been
+  // removed by an external action.
+  void CheckForExternallyRemovedDownloads(JNIEnv* env,
+                                          const JavaParamRef<jobject>& obj,
+                                          bool is_off_the_record);
+
   // DownloadHistory::Observer methods.
   void OnHistoryQueryComplete() override;
 
   // AllDownloadItemNotifier::Observer methods.
   void OnDownloadUpdated(content::DownloadManager* manager,
                          content::DownloadItem* item) override;
   void OnDownloadRemoved(content::DownloadManager* manager,
                          content::DownloadItem* item) override;
 
  protected:
@@ skipping 55 matching lines @@
 
   ResumeCallback resume_callback_for_testing_;
 
   std::unique_ptr<AllDownloadItemNotifier> original_notifier_;
   std::unique_ptr<AllDownloadItemNotifier> off_the_record_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadManagerService);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_MANAGER_SERVICE_H_