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

runtime/bin/file_fuchsia.cc

Index: runtime/bin/file_fuchsia.cc
diff --git a/runtime/bin/file_fuchsia.cc b/runtime/bin/file_fuchsia.cc
index e0d62b41857c2b3ef35bdcb2e18eddfc98c35b6d..fb89e8c284b7129617568b41df8d0f55f43d47d3 100644
--- a/runtime/bin/file_fuchsia.cc
+++ b/runtime/bin/file_fuchsia.cc
@@ -133,11 +133,6 @@ bool File::SetPosition(int64_t position) {
 }
 
 
-// There is no difference between binary and text translation modes on this
-// platform, so this operation is a no-op.
-void File::SetTranslation(DartFileTranslation translation) {}
-
-
 bool File::Truncate(int64_t length) {
   ASSERT(handle_->fd() >= 0);
   return NO_RETRY_EXPECTED(ftruncate(handle_->fd(), length) != -1);