Remove implicit conversions from scoped_refptr to T* in net/disk_cache/

net/disk_cache/cache_creator.cc

 // Copyright (c) 2012 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 "base/files/file_path.h"
 #include "base/metrics/field_trial.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/cache_type.h"
 #include "net/base/net_errors.h"
@@ skipping 160 matching lines @@
     bool force,
     const scoped_refptr<base::SingleThreadTaskRunner>& thread,
     net::NetLog* net_log,
     scoped_ptr<Backend>* backend,
     const net::CompletionCallback& callback) {
   DCHECK(!callback.is_null());
   if (type == net::MEMORY_CACHE) {
     *backend = disk_cache::MemBackendImpl::CreateBackend(max_bytes, net_log);
     return *backend ? net::OK : net::ERR_FAILED;
   }
-  DCHECK(thread);
+  DCHECK(thread.get());
   CacheCreator* creator = new CacheCreator(path,
                                            force,
                                            max_bytes,
                                            type,
                                            backend_type,
                                            kNone,
                                            thread,
                                            net_log,
                                            backend,
                                            callback);
   return creator->Run();
 }
 
 }  // namespace disk_cache