dart:io | Make FileStat.stat throw an exception when the file does not exist, or cannot be accessed.

runtime/bin/file_macos.cc

Index: runtime/bin/file_macos.cc
diff --git a/runtime/bin/file_macos.cc b/runtime/bin/file_macos.cc
index 27f7177e21192e6bc607e4770218bac033892005..e29c6abcf6f640603fb1d3883d3ad052d53601ce 100644
--- a/runtime/bin/file_macos.cc
+++ b/runtime/bin/file_macos.cc
@@ -223,11 +223,6 @@ void File::Stat(const char* name, int64_t* data) {
     data[kSize] = st.st_size;
   } else {
     data[kType] = kDoesNotExist;
-    data[kCreatedTime] = 0;
-    data[kModifiedTime] = 0;
-    data[kAccessedTime] = 0;
-    data[kMode] = 0;
-    data[kSize] = 0;
   }
 }