Revert of Add network throttling as an enterprise policy

chrome/browser/chromeos/net/network_throttling_observer_unittest.cc

Index: chrome/browser/chromeos/net/network_throttling_observer_unittest.cc
diff --git a/chrome/browser/chromeos/net/network_throttling_observer_unittest.cc b/chrome/browser/chromeos/net/network_throttling_observer_unittest.cc
index 40f2b568f51210630e08703b54c9186b2d506fc2..7cbcfc27a562b55cf0aaea6d1521050bac060769 100644
--- a/chrome/browser/chromeos/net/network_throttling_observer_unittest.cc
+++ b/chrome/browser/chromeos/net/network_throttling_observer_unittest.cc
@@ -37,10 +37,10 @@
     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_;