Disable async debugger support until context mismatch issue is resolved.

runtime/vm/object_store.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object_store.h"
 
 #include "vm/exceptions.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 255 matching lines @@
                                       function_name, 1, Object::null_array());
   ASSERT(!function.IsNull());
   set_async_star_move_next_helper(function);
 
   function_name ^= async_lib.PrivateName(Symbols::_CompleteOnAsyncReturn());
   ASSERT(!function_name.IsNull());
   function ^= Resolver::ResolveStatic(async_lib, Object::null_string(),
                                       function_name, 2, Object::null_array());
   ASSERT(!function.IsNull());
   set_complete_on_async_return(function);
-  if (FLAG_async_debugger_stepping) {
+  if (FLAG_async_debugger) {
     // Disable debugging and inlining the _CompleteOnAsyncReturn function.
     function.set_is_debuggable(false);
     function.set_is_inlinable(false);
   }
 
   cls =
       async_lib.LookupClassAllowPrivate(Symbols::_AsyncStarStreamController());
   ASSERT(!cls.IsNull());
   set_async_star_stream_controller(cls);
 
-  if (FLAG_async_debugger_stepping) {
+  if (FLAG_async_debugger) {
     // Disable debugging and inlining of all functions on the
     // _AsyncStarStreamController class.
     const Array& functions = Array::Handle(cls.functions());
     for (intptr_t i = 0; i < functions.Length(); i++) {
       function ^= functions.At(i);
       if (function.IsNull()) {
         break;
       }
       function.set_is_debuggable(false);
       function.set_is_inlinable(false);
@@ skipping 13 matching lines @@
   simple_instance_of_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOf());
   simple_instance_of_true_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfTrue());
   simple_instance_of_false_function_ =
       PrivateObjectLookup(Symbols::_simpleInstanceOfFalse());
 #endif
 }
 
 }  // namespace dart