Move platform_thread to base/threading and put in the base namespace. I left ...

base/debug/trace_event.cc

 // Copyright (c) 2010 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/debug/trace_event.h"
 
 #include "base/format_macros.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
-#include "base/platform_thread.h"
 #include "base/process_util.h"
 #include "base/stringprintf.h"
+#include "base/threading/platform_thread.h"
 #include "base/utf_string_conversions.h"
 #include "base/time.h"
 
 #define USE_UNRELIABLE_NOW
 
 namespace base {
 namespace debug {
 
 static const char* kEventTypeNames[] = {
   "BEGIN",
@@ skipping 135 matching lines @@
 }
 
 void TraceLog::Log(const std::string& msg) {
   AutoLock lock(file_lock_);
 
   fprintf(log_file_, "%s", msg.c_str());
 }
 
 }  // namespace debug
 }  // namespace base