Rename polymer and cr_elements v0_8 to v1_0

third_party/polymer/v1_0/components/iron-pages/README.md

 iron-pages
 ==========
 
 `iron-pages` is used to select one of its children to show. One use is to cycle through a list of
 children "pages".
 
 Example:
 
 ```html
 <iron-pages selected="0">
   <div>One</div>
   <div>Two</div>
   <div>Three</div>
 </iron-pages>
 
 <script>
   document.addEventListener('click', function(e) {
     var pages = document.querySelector('iron-pages');
     pages.selectNext();
   });
 </script>
 ```