Migrate most uses of Isolate::current_zone to Thread::zone.

runtime/vm/service.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/service.h"
 
 #include "include/dart_api.h"
 #include "platform/globals.h"
 
 #include "vm/compiler.h"
@@ skipping 1150 matching lines @@
   }
 
   // Not found.
   return Object::sentinel().raw();
 }
 
 
 static RawObject* LookupHeapObject(Isolate* isolate,
                                    const char* id_original,
                                    ObjectIdRing::LookupResult* result) {
-  char* id = isolate->current_zone()->MakeCopyOfString(id_original);
+  char* id = Thread::Current()->zone()->MakeCopyOfString(id_original);
 
   // Parse the id by splitting at each '/'.
   const int MAX_PARTS = 8;
   char* parts[MAX_PARTS];
   int num_parts = 0;
   int i = 0;
   int start_pos = 0;
   while (id[i] != '\0') {
     if (id[i] == '/') {
       id[i++] = '\0';
@@ skipping 107 matching lines @@
       Message* message = aq.queue()->FindMessageById(message_id);
       if (message == NULL) {
         // The user may try to load an expired message, so we treat
         // unrecognized ids as if they are expired.
         PrintSentinel(js, kExpiredSentinel);
         return true;
       }
       MessageSnapshotReader reader(message->data(),
                                    message->len(),
                                    isolate,
-                                   isolate->current_zone());
+                                   Thread::Current()->zone());
       const Object& msg_obj = Object::Handle(reader.ReadObject());
       msg_obj.PrintJSON(js);
       return true;
     }
   }
   return false;
 }
 
 
 static bool PrintInboundReferences(Isolate* isolate,
@@ skipping 1537 matching lines @@
     ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart