[dart:io][windows] Use WriteFile instead of _write

runtime/bin/file.h

Index: runtime/bin/file.h
diff --git a/runtime/bin/file.h b/runtime/bin/file.h
index 8c859f70eaac332eb37eaece6f95079a2034c96c..5bef22c92c33a9b0ebe1570c5a5ad1fea32f0019 100644
--- a/runtime/bin/file.h
+++ b/runtime/bin/file.h
@@ -60,13 +60,6 @@ class File : public ReferenceCounted<File> {
     kDartWriteOnlyAppend = 4
   };
 
-  // These values have to be kept in sync with the values of
-  // _FileTranslation.text and _FileTranslation.binary in file_impl.dart
-  enum DartFileTranslation {
-    kText = 0,
-    kBinary = 1,
-  };
-
   enum Type { kIsFile = 0, kIsDirectory = 1, kIsLink = 2, kDoesNotExist = 3 };
 
   enum Identical { kIdentical = 0, kDifferent = 1, kError = 2 };
@@ -142,10 +135,6 @@ class File : public ReferenceCounted<File> {
   // Set the byte position in the file.
   bool SetPosition(int64_t position);
 
-  // Set the translation mode of the file. This is currently a no-op unless the
-  // file is for a terminal on Windows.
-  void SetTranslation(DartFileTranslation translation);
-
   // Truncate (or extend) the file to the given length in bytes.
   bool Truncate(int64_t length);