Omnibus Observatory UI fixes:

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

Index: runtime/observatory/lib/src/elements/megamorphiccache_view.dart
diff --git a/runtime/observatory/lib/src/elements/megamorphiccache_view.dart b/runtime/observatory/lib/src/elements/megamorphiccache_view.dart
index 0ab12b925063084b23b3700aab8b75be7f71b8cf..d3f1ccf8d35c292a897875249ef67268d54dbfd8 100644
--- a/runtime/observatory/lib/src/elements/megamorphiccache_view.dart
+++ b/runtime/observatory/lib/src/elements/megamorphiccache_view.dart
@@ -52,7 +52,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
   M.ReachableSizeRepository _reachableSizes;
   M.InboundReferencesRepository _references;
   M.RetainingPathRepository _retainingPaths;
-  M.InstanceRepository _instances;
+  M.ObjectRepository _objects;
 
   M.VMRef get vm => _vm;
   M.IsolateRef get isolate => _isolate;
@@ -70,7 +70,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
       M.ReachableSizeRepository reachableSizes,
       M.InboundReferencesRepository references,
       M.RetainingPathRepository retainingPaths,
-      M.InstanceRepository instances,
+      M.ObjectRepository objects,
       {RenderingQueue queue}) {
     assert(vm != null);
     assert(isolate != null);
@@ -82,7 +82,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
     assert(reachableSizes != null);
     assert(references != null);
     assert(retainingPaths != null);
-    assert(instances != null);
+    assert(objects != null);
     MegamorphicCacheViewElement e = document.createElement(tag.name);
     e._r = new RenderingScheduler(e, queue: queue);
     e._vm = vm;
@@ -95,7 +95,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
     e._reachableSizes = reachableSizes;
     e._references = references;
     e._retainingPaths = retainingPaths;
-    e._instances = instances;
+    e._objects = objects;
     return e;
   }
 
@@ -135,7 +135,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
           new HeadingElement.h2()..text = 'Megamorphic Cache',
           new HRElement(),
           new ObjectCommonElement(_isolate, _cache, _retainedSizes,
-              _reachableSizes, _references, _retainingPaths, _instances,
+              _reachableSizes, _references, _retainingPaths, _objects,
               queue: _r.queue),
           new BRElement(),
           new DivElement()
@@ -170,7 +170,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
                   new DivElement()
                     ..classes = ['memberName']
                     ..children = [
-                      anyRef(_isolate, _cache.buckets, _instances,
+                      anyRef(_isolate, _cache.buckets, _objects,
                           queue: _r.queue)
                     ]
                 ],
@@ -183,7 +183,7 @@ class MegamorphicCacheViewElement extends HtmlElement implements Renderable {
                   new DivElement()
                     ..classes = ['memberName']
                     ..children = [
-                      anyRef(_isolate, _cache.argumentsDescriptor, _instances,
+                      anyRef(_isolate, _cache.argumentsDescriptor, _objects,
                           queue: _r.queue)
                     ]
                 ]