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

chrome/test/automation/autocomplete_edit_proxy.cc

 // Copyright (c) 2006-2009 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 "chrome/test/automation/autocomplete_edit_proxy.h"
 
 #include <vector>
 
+#include "base/threading/platform_thread.h"
 #include "chrome/common/automation_constants.h"
 #include "chrome/common/automation_messages.h"
 #include "chrome/test/automation/automation_proxy.h"
 
 using base::TimeDelta;
 using base::TimeTicks;
 
 bool AutocompleteEditProxy::GetText(std::wstring* text) const {
   if (!is_valid())
     return false;
@@ skipping 40 matching lines @@
 
 bool AutocompleteEditProxy::WaitForQuery(int wait_timeout_ms) const {
   // TODO(jknotten): use a delayed message / observer instead.
   // See, for example, AutocompleteEditProxy::WaitForFocus.
   const TimeTicks start = TimeTicks::Now();
   const TimeDelta timeout = TimeDelta::FromMilliseconds(wait_timeout_ms);
   bool query_in_progress;
   while (TimeTicks::Now() - start < timeout) {
     if (IsQueryInProgress(&query_in_progress) && !query_in_progress)
       return true;
-    PlatformThread::Sleep(automation::kSleepTime);
+    base::PlatformThread::Sleep(automation::kSleepTime);
   }
   // If we get here the query is still in progress.
   return false;
 }
 
 bool AutocompleteEditProxy::GetAutocompleteMatches(Matches* matches) const {
   if (!is_valid())
     return false;
   if (!matches) {
     NOTREACHED();
     return false;
   }
   bool edit_exists = false;
   sender_->Send(new AutomationMsg_AutocompleteEditGetMatches(
       handle_, &edit_exists, matches));
   return edit_exists;
 }