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

components/domain_reliability/monitor_unittest.cc

 // 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.
 
 #include "components/domain_reliability/monitor.h"
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
@@ skipping 50 matching lines @@
         time_(new MockTime()),
         monitor_("test-reporter",
                  pref_task_runner_,
                  network_task_runner_,
                  std::unique_ptr<MockableTime>(time_)) {
     monitor_.MoveToNetworkThread();
     monitor_.InitURLRequestContext(url_request_context_getter_);
     monitor_.SetDiscardUploads(false);
   }
 
+  ~DomainReliabilityMonitorTest() override {
+    monitor_.Shutdown();
+  }
+
   static RequestInfo MakeRequestInfo() {
     RequestInfo request;
     request.status = net::URLRequestStatus();
     request.response_info.socket_address =
         net::HostPortPair::FromString("12.34.56.78:80");
     request.response_info.headers = MakeHttpResponseHeaders(
         "HTTP/1.1 200 OK\n\n");
     request.response_info.was_cached = false;
     request.response_info.network_accessed = true;
     request.response_info.was_fetched_via_proxy = false;
@@ skipping 348 matching lines @@
   request.status = net::URLRequestStatus::FromError(net::ERR_CONNECTION_RESET);
   OnRequestLegComplete(request);
 
   EXPECT_EQ(1u, CountQueuedBeacons(context1));
   EXPECT_EQ(0u, CountQueuedBeacons(context2));
 }
 
 }  // namespace
 
 }  // namespace domain_reliability