Revert "Added page to Observatory to display native memory allocation information."

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 656bf20dc713b20b8808c7ac05670360498aa9e4..cbaae26eff6135bc776a8fa7e941aeac4a4af569 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -776,28 +776,29 @@ abstract class VM extends ServiceObjectOwner implements M.VM {
       return this;
     }
 
+    assert(type == 'Isolate');
     String id = map['id'];
-    if ((id != null) && id.startsWith(_isolateIdPrefix)) {
-      // Check cache.
-      var isolate = _isolateCache[id];
-      if (isolate == null) {
-        // Add new isolate to the cache.
-        isolate = new ServiceObject._fromMap(this, map);
-        _isolateCache[id] = isolate;
-        _buildIsolateList();
-
-        // Eagerly load the isolate.
-        isolate.load().catchError((e, stack) {
-          Logger.root.info('Eagerly loading an isolate failed: $e\n$stack');
-        });
-      } else {
-        isolate.update(map);
-      }
-      return isolate;
+    if (!id.startsWith(_isolateIdPrefix)) {
+      // Currently the VM only supports upgrading Isolate ServiceObjects.
+      throw new UnimplementedError();
+    }
+
+    // Check cache.
+    var isolate = _isolateCache[id];
+    if (isolate == null) {
+      // Add new isolate to the cache.
+      isolate = new ServiceObject._fromMap(this, map);
+      _isolateCache[id] = isolate;
+      _buildIsolateList();
+
+      // Eagerly load the isolate.
+      isolate.load().catchError((e, stack) {
+        Logger.root.info('Eagerly loading an isolate failed: $e\n$stack');
+      });
+    } else {
+      isolate.update(map);
     }
-
-    // Build the object from the map directly.
-    return new ServiceObject._fromMap(this, map);
+    return isolate;
   }
 
   // Note that this function does not reload the isolate if it found
@@ -3008,7 +3009,7 @@ class ServiceFunction extends HeapObject implements M.Function {
   ServiceFunction._empty(ServiceObject owner) : super._empty(owner);
 
   void _update(Map map, bool mapIsRef) {
-    _upgradeCollection(map, owner);
+    _upgradeCollection(map, isolate);
     super._update(map, mapIsRef);
 
     name = map['name'];