Revert "Added ability to request zone memory information for all isolates through the VM service an…

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index 3611ef82a0314e9c451f4c3800e6379eb75723f7..58ef53fefb0b940567960e1500e12d68edc410b9 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -238,9 +238,6 @@ abstract class ServiceObject {
       case 'SourceLocation':
         obj = new SourceLocation._empty(owner);
         break;
-      case '_Thread':
-        obj = new Thread._empty(owner);
-        break;
       case 'UnresolvedSourceLocation':
         obj = new UnresolvedSourceLocation._empty(owner);
         break;
@@ -1504,9 +1501,6 @@ class Isolate extends ServiceObjectOwner implements M.Isolate {
 
   List<ByteData> _chunksInProgress;
 
-  List<Thread> get threads => _threads;
-  final List<Thread> _threads = new List<Thread>();
-
   void _loadHeapSnapshot(ServiceEvent event) {
     if (_snapshotFetch == null || _snapshotFetch.isClosed) {
       // No outstanding snapshot request. Presumably another client asked for a
@@ -1630,11 +1624,6 @@ class Isolate extends ServiceObjectOwner implements M.Isolate {
     if (map['extensionRPCs'] != null) {
       extensionRPCs.addAll(map['extensionRPCs']);
     }
-
-    threads.clear();
-    if(map['threads'] != null) {
-      threads.addAll(map['threads']);
-    }
   }
 
   Future<TagProfile> updateTagProfile() {
@@ -3067,58 +3056,6 @@ class Sentinel extends ServiceObject implements M.Sentinel {
   String get shortName => valueAsString;
 }
 
-class Thread extends ServiceObject implements M.Thread {
-  M.ThreadKind get kind => _kind;
-  M.ThreadKind _kind;
-  List<Zone> get zones => _zones;
-  final List<Zone> _zones = new List<Zone>();
-
-  Thread._empty(ServiceObjectOwner owner) : super._empty(owner);
-
-  void _update(Map map, bool mapIsRef) {
-    String kindString = map['kind'];
-    List<Map> zoneList = map['zones'];
-
-    switch(kindString) {
-      case "kUnknownTask":
-        _kind = M.ThreadKind.unknownTask;
-        break;
-      case "kMutatorTask":
-        _kind = M.ThreadKind.mutatorTask;
-        break;
-      case "kCompilerTask":
-        _kind = M.ThreadKind.compilerTask;
-        break;
-      case "kSweeperTask":
-        _kind = M.ThreadKind.sweeperTask;
-        break;
-      case "kMarkerTask":
-        _kind = M.ThreadKind.markerTask;
-        break;
-      case "kFinalizerTask":
-        _kind = M.ThreadKind.finalizerTask;
-        break;
-      default:
-        assert(false);
-    }
-    zones.clear();
-    zoneList.forEach((zone) {
-      int capacity = zone['capacity'];
-      int used = zone['used'];
-      zones.add(new Zone(capacity, used));
-    });
-  }
-}
-
-class Zone implements M.Zone {
-  int get capacity => _capacity;
-  int _capacity;
-  int get used => _used;
-  int _used;
-
-  Zone(this._capacity, this._used);
-}
-
 class Field extends HeapObject implements M.Field {
   // Library or Class.
   HeapObject dartOwner;