Omnibus Observatory UI fixes:

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

Index: runtime/observatory/lib/src/elements/field_ref.dart
diff --git a/runtime/observatory/lib/src/elements/field_ref.dart b/runtime/observatory/lib/src/elements/field_ref.dart
index b33749e94d42bcace4413e63fae0b2f5fb0aa375..dd351c4678e672d02185a5b4f793fbb09bbf6055 100644
--- a/runtime/observatory/lib/src/elements/field_ref.dart
+++ b/runtime/observatory/lib/src/elements/field_ref.dart
@@ -20,22 +20,22 @@ class FieldRefElement extends HtmlElement implements Renderable {
 
   M.IsolateRef _isolate;
   M.FieldRef _field;
-  M.InstanceRepository _instances;
+  M.ObjectRepository _objects;
 
   M.IsolateRef get isolate => _isolate;
   M.FieldRef get field => _field;
 
   factory FieldRefElement(
-      M.IsolateRef isolate, M.FieldRef field, M.InstanceRepository instances,
+      M.IsolateRef isolate, M.FieldRef field, M.ObjectRepository objects,
       {RenderingQueue queue}) {
     assert(isolate != null);
     assert(field != null);
-    assert(instances != null);
+    assert(objects != null);
     FieldRefElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._isolate = isolate;
     e._field = field;
-    e._instances = instances;
+    e._objects = objects;
     return e;
   }
 
@@ -79,7 +79,7 @@ class FieldRefElement extends HtmlElement implements Renderable {
     } else {
       children = [
         new SpanElement()..text = header,
-        new InstanceRefElement(_isolate, _field.declaredType, _instances,
+        new InstanceRefElement(_isolate, _field.declaredType, _objects,
             queue: _r.queue),
         new SpanElement()..text = ' ',
         new AnchorElement(href: Uris.inspect(_isolate, object: _field))