Fix for Directory.exists on Windows using GetFileAttributes

runtime/bin/directory.cc

Index: runtime/bin/directory.cc
diff --git a/runtime/bin/directory.cc b/runtime/bin/directory.cc
index 8455c39fb5e345fa1b2da7fd2b25cb63ccbbd7a9..9f8252741db1a8781833b245719ed7d3a0943ab4 100644
--- a/runtime/bin/directory.cc
+++ b/runtime/bin/directory.cc
@@ -298,24 +298,18 @@ CObjectArray* DirectoryListing::NewResponse(Response type, char* arg) {
 
 
 bool DirectoryListing::HandleDirectory(char* dir_name) {
-  // TODO(sgjesse): Pass flags to indicate whether directory
-  // responses are needed.
   CObjectArray* response = NewResponse(kListDirectory, dir_name);
   return Dart_PostCObject(response_port_, response->AsApiCObject());
 }
 
 
 bool DirectoryListing::HandleFile(char* file_name) {
-  // TODO(sgjesse): Pass flags to indicate whether file
-  // responses are needed.
   CObjectArray* response = NewResponse(kListFile, file_name);
   return Dart_PostCObject(response_port_, response->AsApiCObject());
 }
 
 
 bool DirectoryListing::HandleError(const char* dir_name) {
-  // TODO(sgjesse): Pass flags to indicate whether error
-  // responses are needed.
   CObject* err = CObject::NewOSError();
   CObjectArray* response = new CObjectArray(CObject::NewArray(3));
   response->SetAt(0, new CObjectInt32(CObject::NewInt32(kListError)));