Domain Reliability: Don't crash on shutdown with uploads pending

components/domain_reliability/uploader.h

 // Copyright 2014 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 COMPONENTS_DOMAIN_RELIABILITY_UPLOADER_H_
 #define COMPONENTS_DOMAIN_RELIABILITY_UPLOADER_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 47 matching lines @@
   // Returns true if the request originated from domain reliability uploader.
   static bool OriginatedFromDomainReliability(const net::URLRequest& request);
 
   // Uploads |report_json| to |upload_url| and calls |callback| when the upload
   // has either completed or failed.
   virtual void UploadReport(const std::string& report_json,
                             int max_beacon_depth,
                             const GURL& upload_url,
                             const UploadCallback& callback) = 0;
 
+  // Shuts down the uploader prior to destruction. Currently, terminates pending
+  // uploads and prevents the uploader from starting new ones to avoid hairy
+  // lifetime issues at destruction.
+  virtual void Shutdown();
+
   virtual void set_discard_uploads(bool discard_uploads) = 0;
 
   static int GetURLRequestUploadDepth(const net::URLRequest& request);
 };
 
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_UPLOADER_H_