include-what-you-use: Fix some tracing-related includes

content/browser/devtools/protocol/tracing_handler.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 "content/browser/devtools/protocol/tracing_handler.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/format_macros.h"
+#include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event_impl.h"
 #include "base/trace_event/tracing_agent.h"
 #include "components/tracing/trace_config_file.h"
 #include "content/browser/devtools/devtools_io_context.h"
 #include "content/browser/tracing/tracing_controller_impl.h"
@@ skipping 255 matching lines @@
 }
 
 bool TracingHandler::IsStartupTracingActive() {
   return ::tracing::TraceConfigFile::GetInstance()->IsEnabled() &&
       TracingController::GetInstance()->IsTracing();
 }
 
 }  // namespace tracing
 }  // namespace devtools
 }  // namespace content