Introduce SystemNetworkContextManager.

content/network/network_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 <memory>
 
 #include "base/run_loop.h"
 #include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/network/network_context.h"
-#include "content/network/network_service.h"
+#include "content/network/network_service_impl.h"
 #include "content/public/common/network_service.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 namespace {
 
 class NetworkServiceTest : public testing::Test {
  public:
   NetworkServiceTest()
       : scoped_task_environment_(
             base::test::ScopedTaskEnvironment::MainThreadType::IO),
-        service_(NetworkService::CreateForTesting()) {}
+        service_(NetworkServiceImpl::CreateForTesting()) {}
   ~NetworkServiceTest() override {}
 
   NetworkService* service() const { return service_.get(); }
 
   void DestroyService() { service_.reset(); }
 
  private:
   base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<NetworkService> service_;
 };
@@ skipping 27 matching lines @@
   DestroyService();
 
   // Destroying the service should destroy the context, causing a connection
   // error.
   run_loop.Run();
 }
 
 }  // namespace
 
 }  // namespace content