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

components/domain_reliability/uploader.h

Index: components/domain_reliability/uploader.h
diff --git a/components/domain_reliability/uploader.h b/components/domain_reliability/uploader.h
index 6962711ce1b1cf62596d7caa0cdcd7d319e3c6cc..c72148f3dfe1fe846a114b2d4ea81fed4758d6ae 100644
--- a/components/domain_reliability/uploader.h
+++ b/components/domain_reliability/uploader.h
@@ -65,6 +65,11 @@ class DOMAIN_RELIABILITY_EXPORT DomainReliabilityUploader {
                             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);