Move sky-box,-button,-checkbox,-radio out of their directories

sky/framework/sky-checkbox/sky-checkbox.sky

Index: sky/framework/sky-checkbox/sky-checkbox.sky
diff --git a/sky/framework/sky-checkbox/sky-checkbox.sky b/sky/framework/sky-checkbox/sky-checkbox.sky
deleted file mode 100644
index 766f2354f593d6fe330710e5cd616b4972d38814..0000000000000000000000000000000000000000
--- a/sky/framework/sky-checkbox/sky-checkbox.sky
+++ /dev/null
@@ -1,73 +0,0 @@
-<!--
-// Copyright 2014 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/framework/sky-button/sky-button.sky" as="SkyButton" />
-
-<sky-element
-    name="sky-checkbox"
-    attributes="checked:boolean"
-    on-click="handleClick">
-<template>
-  <style>
-    :host {
-      display: flex;
-      justify-content: center;
-      align-items: center;
-      -webkit-user-select: none;
-      cursor: pointer;
-      width: 30px;
-      height: 30px;
-    }
-    #container {
-      border: solid 2px;
-      border-color: rgba(90, 90, 90, 0.25);
-      width: 10px;
-      height: 10px;
-    }
-    #container.highlight {
-      border-radius: 10px;
-      background-color: orange;
-      border-color: orange;
-    }
-    #check {
-      top: 0px;
-      left: 0px;
-    }
-    #check.checked {
-      transform: translate(2px, -15px) rotate(45deg);
-      width: 10px;
-      height: 20px;
-      border-style: solid;
-      border-top: none;
-      border-left: none;
-      border-right-width: 2px;
-      border-bottom-width: 2px;
-      border-color: #0f9d58;
-    }
-  </style>
-  <div id="container" class="{{ containerStyle }}">
-    <div id="check" class="{{ checkStyle }}" />
-  </div>
-</template>
-<script>
-module.exports = class extends SkyButton {
-  created() {
-    super.created();
-
-    this.containerStyle = '';
-    this.checkStyle = '';
-  }
-  checkedChanged(oldValue, newValue) {
-    this.checkStyle = newValue ? 'checked' : '';
-  }
-  highlightChanged(oldValue, newValue) {
-    this.containerStyle = newValue ? 'highlight' : '';
-  }
-  handleClick() {
-    this.checked = !this.checked;
-  }
-}.register();
-</script>
-</sky-element>