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

runtime/bin/file_linux.cc

Index: runtime/bin/file_linux.cc
diff --git a/runtime/bin/file_linux.cc b/runtime/bin/file_linux.cc
index 7d974a489ec2bca3cbb75616093c8bbe8124459c..8f1a11448783ca67de45739cef650fd35484da4b 100644
--- a/runtime/bin/file_linux.cc
+++ b/runtime/bin/file_linux.cc
@@ -221,11 +221,6 @@ 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;
   }
 }