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

chrome/browser/metrics/metrics_service.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.
 
-
-
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
 // is the central controller for the acquisition of log data, and the automatic
 // transmission of that log data to an external server.  Its major job is to
 // manage logs, grouping them for transmission, and transmitting them.  As part
 // of its grouping, MS finalizes logs by including some just-in-time gathered
@@ skipping 140 matching lines @@
 //------------------------------------------------------------------------------
 
 #include "chrome/browser/metrics/metrics_service.h"
 
 #include "base/base64.h"
 #include "base/command_line.h"
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/thread.h"
+#include "base/threading/platform_thread.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/load_notification_details.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/metrics/histogram_synchronizer.h"
 #include "chrome/browser/metrics/metrics_log.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 1720 matching lines @@
   RecordCurrentState(pref);
 }
 
 void MetricsService::RecordCurrentState(PrefService* pref) {
   pref->SetInt64(prefs::kStabilityLastTimestampSec, Time::Now().ToTimeT());
 
   RecordPluginChanges(pref);
 }
 
 static bool IsSingleThreaded() {
-  static PlatformThreadId thread_id = 0;
+  static base::PlatformThreadId thread_id = 0;
   if (!thread_id)
-    thread_id = PlatformThread::CurrentId();
-  return PlatformThread::CurrentId() == thread_id;
+    thread_id = base::PlatformThread::CurrentId();
+  return base::PlatformThread::CurrentId() == thread_id;
 }
 
 #if defined(OS_CHROMEOS)
 void MetricsService::StartExternalMetrics() {
   external_metrics_ = new chromeos::ExternalMetrics;
   external_metrics_->Start();
 }
 #endif