Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/net/quota_policy_channel_id_store_unittest.cc

 // Copyright 2014 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/net/quota_policy_channel_id_store.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 50 matching lines @@
         base::ThreadTaskRunnerHandle::Get(),
         NULL);
     std::vector<std::unique_ptr<net::DefaultChannelIDStore::ChannelID>>
         channel_ids;
     Load(&channel_ids);
     ASSERT_EQ(0u, channel_ids.size());
   }
 
   void TearDown() override {
     store_ = NULL;
-    loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   base::ScopedTempDir temp_dir_;
   scoped_refptr<QuotaPolicyChannelIDStore> store_;
   std::vector<std::unique_ptr<net::DefaultChannelIDStore::ChannelID>>
       channel_ids_;
   base::MessageLoop loop_;
 };
 
 // Test if data is stored as expected in the QuotaPolicy database.
@@ skipping 110 matching lines @@
       base::ThreadTaskRunnerHandle::Get(),
       NULL);
 
   // Reload and check that the nonpersistent.com channel IDs have been removed.
   Load(&channel_ids);
   ASSERT_EQ(2U, channel_ids.size());
   for (const auto& id : channel_ids) {
     ASSERT_NE("nonpersistent.com", id->server_identifier());
   }
 }