net: Update FileStream to use base::File instead of PlatformFile.

base/file_util_unittest.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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 2431 matching lines @@
   EXPECT_TRUE(path.IsContentUri());
   EXPECT_TRUE(PathExists(path));
   // The file size may not equal to the input image as MediaStore may convert
   // the image.
   int64 content_uri_size;
   GetFileSize(path, &content_uri_size);
   EXPECT_EQ(image_size, content_uri_size);
 
   // We should be able to read the file.
   char* buffer = new char[image_size];
-  int fd = OpenContentUriForRead(path);
-  EXPECT_LT(0, fd);
-  EXPECT_TRUE(ReadFromFD(fd, buffer, image_size));
+  File file = OpenContentUriForRead(path);
+  EXPECT_TRUE(file.IsValid());
+  EXPECT_TRUE(file.ReadAtCurrentPos(buffer, image_size));
   delete[] buffer;
 }
 
 TEST_F(FileUtilTest, NonExistentContentUriTest) {
   FilePath path("content://foo.bar");
   EXPECT_TRUE(path.IsContentUri());
   EXPECT_FALSE(PathExists(path));
   // Size should be smaller than 0.
   int64 size;
   EXPECT_FALSE(GetFileSize(path, &size));
 
   // We should not be able to read the file.
-  int fd = OpenContentUriForRead(path);
-  EXPECT_EQ(-1, fd);
+  File file = OpenContentUriForRead(path);
+  EXPECT_FALSE(file.IsValid());
 }
 #endif
 
 TEST(ScopedFD, ScopedFDDoesClose) {
   int fds[2];
   char c = 0;
   ASSERT_EQ(0, pipe(fds));
   const int write_end = fds[1];
   base::ScopedFD read_end_closer(fds[0]);
   {
@@ skipping 25 matching lines @@
   // Trying to close it should crash. This is important for security.
   EXPECT_DEATH(CloseWithScopedFD(fds[1]), "");
 #endif
 }
 
 #endif  // defined(OS_POSIX)
 
 }  // namespace
 
 }  // namespace base