MD-Settings: Convert users of cr:cancel to paper-icon-button-light.

ui/webui/resources/cr_elements/shared_style_css.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/shared_vars_css.html">
 <link rel="import" href="hidden_style_css.html">
 
 <!-- Common styles for Material Design WebUI. Included directly in
   settings_shared_css.html. -->
 <dom-module id="cr-shared-style">
   <template>
     <style include="cr-hidden-style">
       /* Chrome spinners should be blue. */
@@ skipping 40 matching lines @@
         background-size: var(--cr-icon-size);
         flex-shrink: 0;
         height: var(--cr-icon-ripple-size);
         width: var(--cr-icon-ripple-size);
       }
 
       button[is='paper-icon-button-light'].subpage-arrow {
         background-image: url(chrome://resources/images/arrow_right.svg);
       }
 
+      button[is='paper-icon-button-light'].icon-cancel {
+        background-image: url(chrome://resources/images/icon_cancel.svg);
+      }
+
+      button[is='paper-icon-button-light'].icon-cancel-toolbar {
+        background-image:
+            url(chrome://resources/images/icon_cancel_toolbar.svg);
+      }
+
       button[is='paper-icon-button-light'].icon-external {
         background-image: url(chrome://resources/images/open_in_new.svg);
       }
 
       .subpage-arrow,
       .icon-external {
         display: none;
       }
 
       paper-icon-button.subpage-arrow {
@@ skipping 34 matching lines @@
       [selectable]:focus,
       [selectable] > :focus {
         @apply(--cr-selectable-focus);
       }
       [selectable] > * {
         @apply(--cr-actionable);
       }
     </style>
   </template>
 </dom-module>