Removed polymer & mirror from Observatory

runtime/observatory/lib/src/app/view_model.dart

Index: runtime/observatory/lib/src/app/view_model.dart
diff --git a/runtime/observatory/lib/src/app/view_model.dart b/runtime/observatory/lib/src/app/view_model.dart
index 94edb496bac325876f8b946aac51a476a80b54c7..494e31bed9748eb8f4a5a5b861d314e829db1052 100644
--- a/runtime/observatory/lib/src/app/view_model.dart
+++ b/runtime/observatory/lib/src/app/view_model.dart
@@ -4,7 +4,7 @@
 
 part of app;
 
-abstract class TableTreeRow extends Observable {
+abstract class TableTreeRow {
   static const arrowRight = '\u2192';
   static const arrowDownRight = '\u21b3';
   // Number of ems each subtree is indented.
@@ -167,7 +167,7 @@ abstract class TableTreeRow extends Observable {
   }
 }
 
-class TableTree extends Observable {
+class TableTree {
   final TableSectionElement tableBody;
   final List<TableTreeRow> rows = [];
   final int columnCount;
@@ -288,7 +288,7 @@ class SortedTableRow {
   SortedTableRow(this.values);
 }
 
-class SortedTable extends Observable {
+class SortedTable {
   final List<SortedTableColumn> columns;
   final List<SortedTableRow> rows = new List<SortedTableRow>();
   final List<int> sortedRows = [];
@@ -300,14 +300,12 @@ class SortedTable extends Observable {
     assert(index >= 0);
     assert(index < columns.length);
     _sortColumnIndex = index;
-    notifyPropertyChange(#getColumnLabel, 0, 1);
   }
   int get sortColumnIndex => _sortColumnIndex;
   bool _sortDescending = true;
   bool get sortDescending => _sortDescending;
   set sortDescending(var descending) {
     _sortDescending = descending;
-    notifyPropertyChange(#getColumnLabel, 0, 1);
   }
 
 
@@ -353,7 +351,7 @@ class SortedTable extends Observable {
     return formatter(value);
   }
 
-  @observable String getColumnLabel(int column) {
+  String getColumnLabel(int column) {
     assert(column >= 0);
     assert(column < columns.length);
     // TODO(johnmccutchan): Move expander display decisions into html once