Fix implicit access to raw pointer of scoped_refptr.

components/tracing/child_memory_dump_manager_delegate_impl.cc

 // Copyright 2015 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 "components/tracing/child_memory_dump_manager_delegate_impl.h"
 
 #include "base/single_thread_task_runner.h"
 #include "build/build_config.h"
 #include "components/tracing/child_trace_message_filter.h"
 #include "components/tracing/process_metrics_memory_dump_provider.h"
@@ skipping 22 matching lines @@
           base::trace_event::MemoryDumpManager::kInvalidTracingProcessId) {
 }
 
 ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {}
 
 void ChildMemoryDumpManagerDelegateImpl::SetChildTraceMessageFilter(
     ChildTraceMessageFilter* ctmf) {
   const auto& task_runner = ctmf ? (ctmf->ipc_task_runner()) : nullptr;
   // Check that we are either registering the CTMF or tearing it down, but not
   // replacing a valid instance with another one (should never happen).
-  DCHECK(ctmf_ == nullptr || (ctmf == nullptr && ctmf_task_runner_ != nullptr));
+  DCHECK(!ctmf_ || (!ctmf && ctmf_task_runner_));
   ctmf_ = ctmf;
 
   {
     base::AutoLock lock(lock_);
     ctmf_task_runner_ = task_runner;
   }
 
   if (ctmf) {
     base::trace_event::MemoryDumpManager::GetInstance()->Initialize(
       this /* delegate */, false /* is_coordinator */);
@@ skipping 43 matching lines @@
 
   // Send the request up to the browser process' MessageDumpmanager.
   ctmf_->SendGlobalMemoryDumpRequest(args, callback);
 }
 
 uint64_t ChildMemoryDumpManagerDelegateImpl::GetTracingProcessId() const {
   return tracing_process_id_;
 }
 
 }  // namespace tracing