Restore KeyedServiceFactory diagnostics for context use-after-destroy.

chrome/browser/extensions/api/downloads/downloads_api_unittest.cc

 // 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.
 
 #include "chrome/browser/extensions/api/downloads/downloads_api.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/download/download_history.h"
 #include "chrome/browser/download/download_service_factory.h"
@@ skipping 11 matching lines @@
 
 namespace {
 
 // A DownloadService that returns a custom DownloadHistory.
 class TestDownloadService : public DownloadServiceImpl {
  public:
   explicit TestDownloadService(Profile* profile)
       : DownloadServiceImpl(profile), profile_(profile) {}
   ~TestDownloadService() override {}
 
+  void Shutdown() override {
+    DownloadServiceImpl::Shutdown();
+    download_history_.reset();
+    router_.reset();
+  }
+
   void set_download_history(std::unique_ptr<DownloadHistory> download_history) {
     download_history_.swap(download_history);
   }
 
   DownloadHistory* GetDownloadHistory() override {
     return download_history_.get();
   }
 
   ExtensionDownloadsEventRouter* GetExtensionEventRouter() override {
     if (!router_.get()) {
@@ skipping 72 matching lines @@
 }
 
 // Tests that Number/double properties in query are parsed correctly.
 // Regression test for https://crbug.com/617435.
 TEST_F(DownloadsApiUnitTest, ParseSearchQuery) {
   RunFunction(new DownloadsSearchFunction, "[{\"totalBytesLess\":1}]");
   RunFunction(new DownloadsSearchFunction, "[{\"totalBytesGreater\":2}]");
 }
 
 }  // namespace extensions