Revert "Build Observatory with runtime"

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

-// 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.
-
-library json_view_element;
-
-import 'package:polymer/polymer.dart';
-import 'observatory_element.dart';
-import 'package:observatory/service.dart';
-
-class JsonPrettyPrinter {
-  String prettyPrint(ServiceMap map) {
-    _buffer.clear();
-    _buffer.write('{\n');
-    _printMap(map, 0);
-    _buffer.write('}\n');
-    return _buffer.toString();
-  }
-
-  void _printMap(ObservableMap map, int depth) {
-    if (_seen.contains(map)) {
-      return;
-    }
-    _seen.add(map);
-    for (var k in map.keys) {
-      var v = map[k];
-      if (v is Map) {
-        _writeIndent(depth);
-        _buffer.write('"$k": {\n');
-        _printMap(v, depth + 1);
-        _writeIndent(depth);
-        _buffer.write('}\n');
-      } else if (v is List) {
-        _writeIndent(depth);
-        _buffer.write('"$k": [\n');
-        _printList(v, depth + 1);
-        _writeIndent(depth);
-        _buffer.write(']\n');
-      } else {
-        _writeIndent(depth);
-        _buffer.write('"$k": $v');
-        _buffer.write('\n');
-      }
-    }
-    _seen.remove(map);
-  }
-
-  void _printList(ObservableList list, int depth) {
-    if (_seen.contains(list)) {
-      return;
-    }
-    _seen.add(list);
-    for (var v in list) {
-      if (v is Map) {
-        _writeIndent(depth);
-        _buffer.write('{\n');
-        _printMap(v, depth + 1);
-        _writeIndent(depth);
-        _buffer.write('}\n');
-      } else if (v is List) {
-        _writeIndent(depth);
-        _buffer.write('[\n');
-        _printList(v, depth + 1);
-        _writeIndent(depth);
-        _buffer.write(']\n');
-      } else {
-        _writeIndent(depth);
-        _buffer.write(v);
-        _buffer.write('\n');
-      }
-    }
-    _seen.remove(list);
-  }
-
-  void _writeIndent(int depth) {
-    const tab = '  ';  // 2 spaces.
-    _buffer.write(tab * depth);
-  }
-
-  final _buffer = new StringBuffer();
-  final _seen = new Set();
-}
-
-
-@CustomTag('json-view')
-class JsonViewElement extends ObservatoryElement {
-  @published ServiceMap map;
-  @observable String mapAsString;
-  JsonViewElement.created() : super.created();
-
-  void mapChanged(oldValue) {
-    var jpp = new JsonPrettyPrinter();
-    mapAsString = jpp.prettyPrint(map);
-  }
-}