Rationalize Dart mojo and sky package structure

sky/framework/elements/sky-menu-item.sky

Index: sky/framework/elements/sky-menu-item.sky
diff --git a/sky/framework/elements/sky-menu-item.sky b/sky/framework/elements/sky-menu-item.sky
deleted file mode 100644
index 2bf7aa88db0fe58041d61a6debe75c662f0f58d0..0000000000000000000000000000000000000000
--- a/sky/framework/elements/sky-menu-item.sky
+++ /dev/null
@@ -1,82 +0,0 @@
-<!--
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
--->
-<import src="sky-element.sky" />
-<import src="material-element.sky" />
-<import src="sky-icon.sky" />
-
-<sky-element attributes="icon:string">
-<template>
-  <style>
-    :host {
-      display: flex;
-      flex-direction: row;
-      align-items: center;
-      height: 48px;
-      -webkit-user-select: none;
-    }
-    #background {
-      display: flex;
-      flex-direction: row;
-      align-items: center;
-      height: 100%;
-      flex: 1;
-    }
-    #background[highlight] {
-      background: rgba(153, 153, 153, 0.4);
-    }
-    sky-icon {
-      padding: 0px 16px;
-    }
-    #label {
-      font-family: 'Roboto Medium', 'Helvetica';
-      color: #212121;
-      padding: 0px 16px;
-      flex: 1;
-    }
-  </style>
-  <div id="background">
-    <sky-icon size="24" />
-    <div id="label">
-      <content />
-    </div>
-  </div>
-</template>
-<script>
-import "dart:sky";
-
-@Tagname('sky-menu-item')
-class SkyMenuItem extends MaterialElement {
-  SkyIcon _icon;
-  Element _label;
-
-  SkyMenuItem() {
-    addEventListener('pointerdown', _handlePointerDown);
-    addEventListener('pointerup', _handlePointerUp);
-    addEventListener('pointercancel', _handlePointerUp);
-  }
-
-  void shadowRootReady() {
-    _icon = shadowRoot.querySelector('sky-icon');
-    _icon.type = "${icon}_grey600";
-  }
-
-  void iconChanged(String oldValue, String newValue) {
-    if (_icon != null)
-      _icon.type = "${newValue}_grey600";
-  }
-
-  void _handlePointerDown(Event event) {
-    shadowRoot.getElementById('background').setAttribute('highlight', '');
-  }
-
-  void _handlePointerUp(Event event) {
-    shadowRoot.getElementById('background').removeAttribute('highlight');
-  }
-}
-
-_init(script) => register(script, SkyMenuItem);
-</script>
-</sky-element>