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

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index 55ed95260d7936bb7a577c700df043824ae6f398..feeb130fec57106d5851ef6b3fde0b32920e0b55 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -76,22 +76,6 @@ void FUNCTION_NAME(File_SetPointer)(Dart_NativeArguments args) {
 }
 
 
-void FUNCTION_NAME(File_SetTranslation)(Dart_NativeArguments args) {
-  File* file = GetFile(args);
-  ASSERT(file != NULL);
-  int64_t translation;
-  Dart_Handle status = Dart_GetNativeIntegerArgument(args, 1, &translation);
-  if (Dart_IsError(status)) {
-    Dart_PropagateError(status);
-  }
-  if ((translation != File::kText) && (translation != File::kBinary)) {
-    Dart_ThrowException(DartUtils::NewDartArgumentError(
-        "The argument must be a FileTranslation mode"));
-  }
-  file->SetTranslation(static_cast<File::DartFileTranslation>(translation));
-}
-
-
 void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));