Revert "De-mangle private identifiers returned by the debugger API."

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 19602e576a1543e907cd52fc68c68d7d43646817..60b8df65a8da5da7aad0feed1127e48ec915e6bb 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -1749,7 +1749,6 @@ RawArray* Debugger::GetInstanceFields(const Instance& obj) {
         field_name = field.name();
         field_list.Add(field_name);
         field_value = GetInstanceField(cls, field_name, obj);
-        field_name = String::IdentifierPrettyName(field_name);
         field_list.Add(field_value);
       }
     }
@@ -1771,7 +1770,6 @@ RawArray* Debugger::GetStaticFields(const Class& cls) {
     if (field.is_static()) {
       field_name = field.name();
       field_value = GetStaticField(cls, field_name);
-      field_name = String::IdentifierPrettyName(field_name);
       field_list.Add(field_name);
       field_list.Add(field_value);
     }
@@ -1805,7 +1803,6 @@ void Debugger::CollectLibraryFields(const GrowableObjectArray& field_list,
       if (!prefix.IsNull()) {
         field_name = String::Concat(prefix, field_name);
       }
-      field_name = String::IdentifierPrettyName(field_name);
       field_list.Add(field_name);
       field_list.Add(field_value);
     }