Fixed build issue introduced with last commit.

runtime/vm/thread.cc

 // Copyright (c) 2015, 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/thread.h"
 
 #include "vm/compiler_stats.h"
 #include "vm/dart_api_state.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
@@ skipping 193 matching lines @@
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_ALLOCATION)
 #undef REUSABLE_HANDLE_ALLOCATION
 }
 
 
 #ifndef PRODUCT
 // Collect information about each individual zone associated with this thread.
 void Thread::PrintJSON(JSONStream* stream) const {
   JSONObject jsobj(stream);
   jsobj.AddProperty("type", "_Thread");
-  jsobj.AddPropertyF("id", "threads/%" Pd64 "",
-                     ThreadIdToIntPtr(os_thread()->trace_id()));
+  jsobj.AddPropertyF("id", "threads/%" Pd "",
+                     OSThread::ThreadIdToIntPtr(os_thread()->trace_id()));
   Zone* zone = zone_;
   {
     JSONArray zone_info_array(&jsobj, "zones");
     zone = zone_;
     while (zone != NULL) {
       zone_info_array.AddValue(zone);
       zone = zone->previous();
     }
   }
 }
@@ skipping 568 matching lines @@
 
 DisableThreadInterruptsScope::~DisableThreadInterruptsScope() {
   if (thread() != NULL) {
     OSThread* os_thread = thread()->os_thread();
     ASSERT(os_thread != NULL);
     os_thread->EnableThreadInterrupts();
   }
 }
 
 }  // namespace dart