Revert 123140 - Use SequencedWorkerPool for disk operations in TraceSubscriberStdio.

content/common/child_trace_message_filter.h

Index: content/common/child_trace_message_filter.h
===================================================================
--- content/common/child_trace_message_filter.h	(revision 123143)
+++ content/common/child_trace_message_filter.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -31,7 +31,8 @@
 
   // Callback from trace subsystem.
   void OnTraceDataCollected(
-      const scoped_refptr<base::RefCountedString>& events_str_ptr);
+      const scoped_refptr<base::debug::TraceLog::RefCountedString>&
+          events_str_ptr);
   void OnTraceBufferFull();
 
   IPC::Channel* channel_;