Remove the Dromaeo and TodoMVC samples.

samples/third_party/todomvc_performance/js_todomvc/elements/td-item.html

-<link rel="import" href="../components/polymer/polymer.html">
-<link rel="import" href="td-input.html">
-
-<polymer-element name="td-item" extends="li" attributes="item editing" on-blur="{{commitAction}}">
-        <template>
-                <link rel="stylesheet" href="td-item.css">
-                <div class="view {{ {completed: item.completed, editing: editing} | tokenList }}" hidden?="{{editing}}" on-dblclick="{{editAction}}">
-                        <input type="checkbox" class="toggle" checked="{{item.completed}}" on-click="{{itemChangeAction}}">
-                        <label>{{item.title}}</label>
-                        <button class="destroy" on-click="{{destroyAction}}"></button>
-                </div>
-                <input is="td-input" id="edit" class="edit" value="{{item.title}}" hidden?="{{!editing}}" on-td-input-commit="{{commitAction}}" on-td-input-cancel="{{cancelAction}}">
-        </template>
-        <script>
-                (function() {
-                        Polymer('td-item', {
-                                editing: false,
-                                editAction: function() {
-                                        this.editing = true;
-                                        // schedule focus for the end of microtask, when the input will be visible
-                                        this.asyncMethod(function() {
-                                                this.$.edit.focus();
-                                        });
-                                },
-                                commitAction: function() {
-                                        if (this.editing) {
-                                                this.editing = false;
-                                                this.item.title = this.item.title.trim();
-                                                if (this.item.title === '') {
-                                                        this.destroyAction();
-                                                }
-                                                this.fire('td-item-changed');
-                                        }
-                                },
-                                cancelAction: function() {
-                                        this.editing = false;
-                                },
-                                itemChangeAction: function() {
-                                        this.fire('td-item-changed');
-                                },
-                                destroyAction: function() {
-                                        this.fire('td-destroy-item', this.item);
-                                }
-                        });
-                })();
-        </script>
-</polymer-element>