Do not do unnecessary recursive deletes for files.

storage/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 "storage/browser/fileapi/file_system_usage_cache.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 133 matching lines @@
 bool FileSystemUsageCache::Exists(const base::FilePath& usage_file_path) {
   TRACE_EVENT0("FileSystem", "UsageCache::Exists");
   DCHECK(CalledOnValidThread());
   return base::PathExists(usage_file_path);
 }
 
 bool FileSystemUsageCache::Delete(const base::FilePath& usage_file_path) {
   TRACE_EVENT0("FileSystem", "UsageCache::Delete");
   DCHECK(CalledOnValidThread());
   CloseCacheFiles();
-  return base::DeleteFile(usage_file_path, true);
+  return base::DeleteFile(usage_file_path, false);
 }
 
 void FileSystemUsageCache::CloseCacheFiles() {
   TRACE_EVENT0("FileSystem", "UsageCache::CloseCacheFiles");
   DCHECK(CalledOnValidThread());
   STLDeleteValues(&cache_files_);
   timer_.reset();
 }
 
 bool FileSystemUsageCache::Read(const base::FilePath& usage_file_path,
@@ skipping 128 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 storage