Upgrade to 1.0 and switch clients to dom-repeat where needed.

third_party/polymer/v0_8/components-chromium/paper-checkbox/paper-checkbox.css

 /*
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
 :host {
@@ skipping 20 matching lines @@
   vertical-align: middle;
 }
 
 :host #ink {
   position: absolute;
   top: -15px;
   left: -15px;
   width: 48px;
   height: 48px;
   color: var(--paper-checkbox-unchecked-ink-color);
+  opacity: 0.6;
 }
 
 :host #ink[checked] {
   color: var(--paper-checkbox-checked-ink-color);
 }
 
 :host #checkbox {
   position: relative;
   box-sizing: border-box;
   height: 100%;
@@ skipping 63 matching lines @@
 }
 
 /* label */
 #checkboxLabel {
   position: relative;
   display: inline-block;
   vertical-align: middle;
   padding-left: 8px;
   white-space: normal;
   pointer-events: none;
+  color: var(--paper-checkbox-label-color);
 }
 
 #checkboxLabel[hidden] {
   display: none;
 }
 
 /* disabled state */
 :host([disabled]) {
   pointer-events: none;
 }
 
 :host([disabled]) #checkbox {
-  opacity: 0.33;
+  opacity: 0.5;
   border-color: var(--paper-checkbox-unchecked-color);
 }
 
 :host([disabled][checked]) #checkbox {
   background-color: var(--paper-checkbox-unchecked-color);
+  opacity: 0.5;
 }
+
+:host([disabled]) #checkboxLabel  {
+  opacity: 0.65;
+}