Add missing #include around sequenced_worker_pool.h in //chrome

chrome/browser/platform_util_linux.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/platform_util.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/process/kill.h"
 #include "base/process/launch.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "base/version.h"
 #include "chrome/browser/platform_util_internal.h"
 #include "content/public/browser/browser_thread.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 
 namespace platform_util {
 
 namespace {
@@ skipping 143 matching lines @@
 
 void OpenExternal(Profile* profile, const GURL& url) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (url.SchemeIs("mailto"))
     XDGEmail(url.spec());
   else
     XDGOpen(base::FilePath(), url.spec());
 }
 
 }  // namespace platform_util