Remove isolate argument from handle allocation: Part II

runtime/vm/tags.cc

 // Copyright (c) 2014, 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/tags.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/native_entry.h"
 #include "vm/runtime_entry.h"
@@ skipping 127 matching lines @@
     for (intptr_t i = 1; i < VMTag::kNumVMTags; i++) {
       arr.AddValue64(counters_[i]);
     }
   }
 }
 
 
 const char* UserTags::TagName(uword tag_id) {
   ASSERT(tag_id >= kUserTagIdOffset);
   ASSERT(tag_id < kUserTagIdOffset + kMaxUserTags);
-  Isolate* isolate = Isolate::Current();
+  Zone* zone = Thread::Current()->zone();
   const UserTag& tag =
-      UserTag::Handle(isolate, UserTag::FindTagById(tag_id));
+      UserTag::Handle(zone, UserTag::FindTagById(tag_id));
   ASSERT(!tag.IsNull());
-  const String& label = String::Handle(isolate, tag.label());
+  const String& label = String::Handle(zone, tag.label());
   return label.ToCString();
 }
 
 
 }  // namespace dart