Do not call stat() when reading directories via File API.

chrome/browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm

 // 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.
 
 #import <Foundation/Foundation.h>
 #import <ImageCaptureCore/ImageCaptureCore.h>
 
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 382 matching lines @@
   delegate_->ItemAdded("name2", info1);
   delegate_->NoMoreItems();
 
   EXPECT_EQ(base::File::FILE_OK,
             GetFileInfo(base::FilePath("/ic:id/name2"), &info));
   EXPECT_EQ(info1.size, info.size);
 
   EXPECT_EQ(base::File::FILE_OK, ReadDir(base::FilePath(kDevicePath)));
 
   ASSERT_EQ(2U, file_list_.size());
-  EXPECT_EQ(time1, file_list_[0].last_modified_time);
   EXPECT_FALSE(file_list_[0].is_directory);
   EXPECT_EQ("name1", file_list_[0].name);
 
-  EXPECT_EQ(time1, file_list_[1].last_modified_time);
   EXPECT_FALSE(file_list_[1].is_directory);
   EXPECT_EQ("name2", file_list_[1].name);
 }
 
 TEST_F(MTPDeviceDelegateImplMacTest, TestDirectoriesAndSorting) {
   base::Time time1 = base::Time::Now();
   base::File::Info info1;
   info1.size = 1;
   info1.is_directory = false;
   info1.is_symbolic_link = false;
   info1.last_modified = time1;
   info1.last_accessed = time1;
   info1.creation_time = time1;
   delegate_->ItemAdded("name2", info1);
 
   info1.is_directory = true;
   delegate_->ItemAdded("dir2", info1);
   delegate_->ItemAdded("dir1", info1);
 
   info1.is_directory = false;
   delegate_->ItemAdded("name1", info1);
   delegate_->NoMoreItems();
 
   EXPECT_EQ(base::File::FILE_OK, ReadDir(base::FilePath(kDevicePath)));
 
   ASSERT_EQ(4U, file_list_.size());
   EXPECT_EQ("dir1", file_list_[0].name);
   EXPECT_EQ("dir2", file_list_[1].name);
-  EXPECT_EQ(time1, file_list_[2].last_modified_time);
   EXPECT_FALSE(file_list_[2].is_directory);
   EXPECT_EQ("name1", file_list_[2].name);
 
-  EXPECT_EQ(time1, file_list_[3].last_modified_time);
   EXPECT_FALSE(file_list_[3].is_directory);
   EXPECT_EQ("name2", file_list_[3].name);
 }
 
 TEST_F(MTPDeviceDelegateImplMacTest, SubDirectories) {
   base::Time time1 = base::Time::Now();
   base::File::Info info1;
   info1.size = 0;
   info1.is_directory = true;
   info1.is_symbolic_link = false;
@@ skipping 96 matching lines @@
                          temp_dir_.path().Append("target")));
 
   EXPECT_EQ(base::File::FILE_OK,
             DownloadFile(base::FilePath("/ic:id/filename"),
                          temp_dir_.path().Append("target")));
   std::string contents;
   EXPECT_TRUE(base::ReadFileToString(temp_dir_.path().Append("target"),
                                      &contents));
   EXPECT_EQ(kTestFileContents, contents);
 }