Convert WebRtcLoggingHandlerHost to use the blocking thread pool.

chrome/browser/browsing_data/browsing_data_remover.cc

 // Copyright (c) 2012 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/browser/browsing_data/browsing_data_remover.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 370 matching lines @@
                      base::Unretained(this)));
 
       autofill::PersonalDataManager* data_manager =
           autofill::PersonalDataManagerFactory::GetForProfile(profile_);
       if (data_manager)
         data_manager->Refresh();
     }
 
 #if defined(ENABLE_WEBRTC)
     waiting_for_clear_webrtc_logs_ = true;
-    BrowserThread::PostTaskAndReply(
-        BrowserThread::FILE,
+    BrowserThread::PostBlockingPoolTaskAndReply(
         FROM_HERE,
         base::Bind(
             &WebRtcLogUtil::DeleteOldAndRecentWebRtcLogFiles,
             WebRtcLogList::GetWebRtcLogDirectoryForProfile(profile_->GetPath()),
             delete_begin_),
         base::Bind(&BrowsingDataRemover::OnClearedWebRtcLogs,
                    base::Unretained(this)));
 #endif
   }
 
@@ skipping 743 matching lines @@
   waiting_for_clear_webrtc_logs_ = false;
   NotifyAndDeleteIfDone();
 }
 #endif
 
 void BrowsingDataRemover::OnClearedDomainReliabilityMonitor() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   waiting_for_clear_domain_reliability_monitor_ = false;
   NotifyAndDeleteIfDone();
 }