add missing header in webkit/browser/fileapi/file_system_usage_cache.cc

webkit/browser/fileapi/file_system_usage_cache.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 "webkit/browser/fileapi/file_system_usage_cache.h"
 
 #include <utility>
 
+#include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/pickle.h"
 #include "base/stl_util.h"
 #include "webkit/browser/fileapi/timed_task_helper.h"
 
 namespace fileapi {
 
 namespace {
@@ skipping 287 matching lines @@
   return !task_runner_.get() || task_runner_->RunsTasksOnCurrentThread();
 }
 
 bool FileSystemUsageCache::HasCacheFileHandle(const base::FilePath& file_path) {
   DCHECK(CalledOnValidThread());
   DCHECK_LE(cache_files_.size(), kMaxHandleCacheSize);
   return ContainsKey(cache_files_, file_path);
 }
 
 }  // namespace fileapi