Convert WebRtcLoggingHandlerHost to use the blocking thread pool.

chrome/browser/media/webrtc_log_util.cc

 // Copyright 2014 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/media/webrtc_log_util.h"
 
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
+#include "base/files/file_path.h"
 #include "base/logging.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/media/webrtc_log_list.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace {
 
 const int kDaysToKeepLogs = 5;
@@ skipping 17 matching lines @@
 
 // static
 void WebRtcLogUtil::DeleteOldWebRtcLogFiles(const base::FilePath& log_dir) {
   DeleteOldAndRecentWebRtcLogFiles(log_dir, base::Time::Max());
 }
 
 // static
 void WebRtcLogUtil::DeleteOldAndRecentWebRtcLogFiles(
     const base::FilePath& log_dir,
     const base::Time& delete_begin_time) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+  base::ThreadRestrictions::AssertIOAllowed();
 
   if (!base::PathExists(log_dir)) {
     // This will happen if no logs have been stored or uploaded.
     DVLOG(3) << "Could not find directory: " << log_dir.value();
     return;
   }
 
   const base::Time now = base::Time::Now();
   const base::TimeDelta time_to_keep_logs =
       base::TimeDelta::FromDays(kDaysToKeepLogs);
@@ skipping 43 matching lines @@
 }
 
 // static
 void WebRtcLogUtil::DeleteOldWebRtcLogFilesForAllProfiles() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
   ProfileInfoCache& profile_cache =
       g_browser_process->profile_manager()->GetProfileInfoCache();
   size_t profiles_count = profile_cache.GetNumberOfProfiles();
   for (size_t i = 0; i < profiles_count; ++i) {
-    content::BrowserThread::PostTask(
-        content::BrowserThread::FILE,
+    content::BrowserThread::PostBlockingPoolTask(
         FROM_HERE,
         base::Bind(&DeleteOldWebRtcLogFiles,
                    WebRtcLogList::GetWebRtcLogDirectoryForProfile(
                        profile_cache.GetPathOfProfileAtIndex(i))));
   }
 }