Revert of Add network throttling as an enterprise policy

chrome/browser/chromeos/net/network_throttling_observer_unittest.cc

 // Copyright (c) 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 <memory>
 
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/chromeos/net/network_throttling_observer.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ skipping 19 matching lines @@
     std::unique_ptr<DBusThreadManagerSetter> dbus_setter =
         DBusThreadManager::GetSetterForTesting();
     mock_manager_client_ = new NiceMock<MockShillManagerClient>();
     dbus_setter->SetShillManagerClient(
         std::unique_ptr<ShillManagerClient>(mock_manager_client_));
     NetworkStateHandler::InitializeForTest();
     NetworkHandler::Initialize();
     local_state_ = new TestingPrefServiceSimple();
     local_state_->registry()->RegisterDictionaryPref(
         prefs::kNetworkThrottlingEnabled);
-    observer_ = base::MakeUnique<NetworkThrottlingObserver>(local_state_);
+    observer_.reset(new NetworkThrottlingObserver(local_state_));
   }
 
-  ~NetworkThrottlingObserverTest() override { DBusThreadManager::Shutdown(); }
+  ~NetworkThrottlingObserverTest() override { delete mock_manager_client_; }
 
   std::unique_ptr<base::MessageLoop> message_loop_;
   std::unique_ptr<NetworkThrottlingObserver> observer_;
   TestingPrefServiceSimple* local_state_;
   MockShillManagerClient* mock_manager_client_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NetworkThrottlingObserverTest);
 };
 
@@ skipping 17 matching lines @@
 
   // Clearing the preference should disable throttling
   EXPECT_CALL(*mock_manager_client_,
               SetNetworkThrottlingStatus(false, 0, 0, _, _))
       .Times(1);
   local_state_->ClearPref(prefs::kNetworkThrottlingEnabled);
 }
 
 }  // namespace test
 }  // namespace chromeos