Store BackgroundFetchRequestInfo in a refcounted pointer

content/browser/background_fetch/background_fetch_service_unittest.cc

 // Copyright 2017 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 <map>
 #include <memory>
 #include <utility>
 
 #include "base/guid.h"
 #include "base/macros.h"
@@ skipping 222 matching lines @@
     context_ = new BackgroundFetchContext(
         browser_context(), storage_partition,
         make_scoped_refptr(embedded_worker_test_helper()->context_wrapper()));
     service_ = base::MakeUnique<BackgroundFetchServiceImpl>(
         0 /* render_process_id */, context_);
   }
 
   void TearDown() override {
     service_.reset();
 
+    EXPECT_CALL(*download_manager_, Shutdown()).Times(1);
+
     context_->Shutdown();
     context_ = nullptr;
 
     // Give pending shutdown operations a chance to finish.
     base::RunLoop().RunUntilIdle();
 
     BackgroundFetchTestBase::TearDown();
   }
 
  private:
@@ skipping 373 matching lines @@
     const bool has_alternative_tag =
         tags[0] == kAlternativeTag || tags[1] == kAlternativeTag;
 
     EXPECT_TRUE(has_example_tag);
     EXPECT_TRUE(has_alternative_tag);
   }
 }
 
 }  // namespace
 }  // namespace content