[dart:io][windows] Make unicode characters display correctly.

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 b18f4237177103f148d7b7ef4e10675c1cf10d04..7310f43b199856125ea966e623815cef4d074e0b 100644
--- a/runtime/bin/file_fuchsia.cc
+++ b/runtime/bin/file_fuchsia.cc
@@ -112,6 +112,11 @@ 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);