Remove some PlatformFile uses from WebKit

webkit/browser/blob/local_file_stream_reader_unittest.cc

Index: webkit/browser/blob/local_file_stream_reader_unittest.cc
diff --git a/webkit/browser/blob/local_file_stream_reader_unittest.cc b/webkit/browser/blob/local_file_stream_reader_unittest.cc
index bdd1cdc592c4ff34b30ba8cfba7002815c2b4f61..43001ef5a1bc6ae6c21cd686bf90d443d0b25b1d 100644
--- a/webkit/browser/blob/local_file_stream_reader_unittest.cc
+++ b/webkit/browser/blob/local_file_stream_reader_unittest.cc
@@ -7,10 +7,10 @@
 #include <string>
 
 #include "base/file_util.h"
+#include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/platform_file.h"
 #include "base/run_loop.h"
 #include "base/threading/thread.h"
 #include "net/base/io_buffer.h"
@@ -135,14 +135,9 @@ TEST_F(LocalFileStreamReaderTest, NonExistent) {
 
 TEST_F(LocalFileStreamReaderTest, Empty) {
   base::FilePath empty_path = test_dir().AppendASCII("empty");
-  base::PlatformFileError error = base::PLATFORM_FILE_OK;
-  base::PlatformFile file = base::CreatePlatformFile(
-      empty_path,
-      base::PLATFORM_FILE_CREATE | base::PLATFORM_FILE_READ,
-      NULL, &error);
-  ASSERT_EQ(base::PLATFORM_FILE_OK, error);
-  ASSERT_NE(base::kInvalidPlatformFileValue, file);
-  base::ClosePlatformFile(file);
+  base::File file(empty_path, base::File::FLAG_CREATE | base::File::FLAG_READ);
+  ASSERT_TRUE(file.IsValid());
+  file.Close();
 
   scoped_ptr<LocalFileStreamReader> reader(
       CreateFileReader(empty_path, 0, base::Time()));