Remove some Isolate::current_zone() calls, as it gets the zone from mutator thread not the current …

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 1535 matching lines @@
 
 
 void BackgroundCompiler::EnsureInit(Isolate* isolate) {
   bool start_task = false;
   {
     MutexLocker ml(isolate->mutex());
     if (isolate->background_compiler() == NULL) {
       BackgroundCompiler* task = new BackgroundCompiler(isolate);
       isolate->set_background_compiler(task);
       isolate->set_background_compilation_queue(GrowableObjectArray::Handle(
-          isolate->current_zone(), GrowableObjectArray::New()));
+          GrowableObjectArray::New()));
       start_task = true;
     }
   }
   if (start_task) {
     Dart::thread_pool()->Run(isolate->background_compiler());
   }
 }
 
 }  // namespace dart