Omnibus Observatory UI fixes:

runtime/observatory/lib/src/elements/heap_snapshot.dart

 // Copyright (c) 2015, 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.
 
 // 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.
 
 import 'dart:async';
 import 'dart:html';
@@ skipping 30 matching lines @@
 
   RenderingScheduler<HeapSnapshotElement> _r;
 
   Stream<RenderedEvent<HeapSnapshotElement>> get onRendered => _r.onRendered;
 
   M.VM _vm;
   M.IsolateRef _isolate;
   M.EventRepository _events;
   M.NotificationRepository _notifications;
   M.HeapSnapshotRepository _snapshots;
-  M.InstanceRepository _instances;
+  M.ObjectRepository _objects;
   M.HeapSnapshot _snapshot;
   Stream<M.HeapSnapshotLoadingProgressEvent> _progressStream;
   M.HeapSnapshotLoadingProgress _progress;
   M.HeapSnapshotRoots _roots = M.HeapSnapshotRoots.user;
   HeapSnapshotTreeMode _mode = HeapSnapshotTreeMode.dominatorTree;
 
   M.IsolateRef get isolate => _isolate;
   M.NotificationRepository get notifications => _notifications;
   M.HeapSnapshotRepository get profiles => _snapshots;
   M.VMRef get vm => _vm;
 
   factory HeapSnapshotElement(
       M.VM vm,
       M.IsolateRef isolate,
       M.EventRepository events,
       M.NotificationRepository notifications,
       M.HeapSnapshotRepository snapshots,
-      M.InstanceRepository instances,
+      M.ObjectRepository objects,
       {RenderingQueue queue}) {
     assert(vm != null);
     assert(isolate != null);
     assert(events != null);
     assert(notifications != null);
     assert(snapshots != null);
-    assert(instances != null);
+    assert(objects != null);
     HeapSnapshotElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._vm = vm;
     e._isolate = isolate;
     e._events = events;
     e._notifications = notifications;
     e._snapshots = snapshots;
-    e._instances = instances;
+    e._objects = objects;
     return e;
   }
 
   HeapSnapshotElement.created() : super.created();
 
   @override
   attached() {
     super.attached();
     _r.enable();
     _refresh();
@@ skipping 316 matching lines @@
     if (node.isStack) {
       wrapper
         ..text = ''
         ..children = [
           new AnchorElement(href: Uris.debugger(isolate))..text = 'stack frames'
         ];
     } else {
       node.object.then((object) {
         wrapper
           ..text = ''
-          ..children = [anyRef(_isolate, object, _instances, queue: _r.queue)];
+          ..children = [anyRef(_isolate, object, _objects, queue: _r.queue)];
       });
     }
   }
 
   void _updateMergedDominator(
       HtmlElement element, M.HeapSnapshotMergedDominatorNode node, int depth) {
     element.children[0].text = Utils.formatSize(node.retainedSize);
     _updateLines(element.children[1].children, depth);
     if (_getChildrenMergedDominator(node).isNotEmpty) {
       element.children[2].text = _tree.isExpanded(node) ? '▼' : '►';
@@ skipping 11 matching lines @@
         ..text = ''
         ..children = [
           new AnchorElement(href: Uris.debugger(isolate))..text = 'stack frames'
         ];
     } else {
       node.klass.then((klass) {
         wrapper
           ..text = ''
           ..children = [
             new SpanElement()..text = '${node.instanceCount} instances of ',
-            anyRef(_isolate, klass, _instances, queue: _r.queue)
+            anyRef(_isolate, klass, _objects, queue: _r.queue)
           ];
       });
     }
   }
 
   void _updateGroup(HtmlElement element, item, int depth) {
     _updateLines(element.children[1].children, depth);
     if (item is M.HeapSnapshotClassReferences) {
       element.children[0].text = Utils.formatSize(item.shallowSize);
       element.children[2].text = _tree.isExpanded(item) ? '▼' : '►';
@@ skipping 103 matching lines @@
               value: modeToString(mode), selected: _mode == mode)
             ..text = modeToString(mode);
         }).toList(growable: false)
         ..onChange.listen((_) {
           _mode = HeapSnapshotTreeMode.values[s.selectedIndex];
           _r.dirty();
         })
     ];
   }
 }