MD Settings: convert paper-icon-button to paper-icon-button-light.

chrome/browser/resources/settings/a11y_page/manage_a11y_page.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
-<link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="../controls/settings_slider.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../route.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="../settings_vars_css.html">
 
 <dom-module id="settings-manage-a11y-page">
   <template>
     <style include="settings-shared">
@@ skipping 108 matching lines @@
       <settings-toggle-button
           pref="{{prefs.settings.a11y.caret_highlight}}"
           label="$i18n{caretHighlightLabel}">
       </settings-toggle-button>
     </div>
     <template is="dom-if" if="[[showExperimentalFeatures_]]">
       <div class="settings-box block" actionable>
         <settings-toggle-button
             pref="{{prefs.settings.a11y.switch_access}}"
             label="$i18n{switchAccessLabel}">
-          <paper-icon-button icon="cr:settings_icon"
-              class="more-actions"
+          <button is="paper-icon-button-light"
+              class="icon-settings more-actions"
               on-tap="onSwitchAccessSettingsTap_"
               hidden="[[!prefs.settings.a11y.switch_access.value]]"
               aria-label="$i18n{selectToSpeakOptionsLabel}">
-          </paper-icon-button>
+          </button>
         </settings-toggle-button>
       </div>
     </template>
     <div class="settings-box two-line" on-tap="onKeyboardTap_" actionable>
       <div class="start">
         $i18n{keyboardSettingsTitle}
         <div class="secondary" id="keyboardSettingsSecondary">
           $i18n{keyboardSettingsDescription}
         </div>
       </div>
@@ skipping 70 matching lines @@
           </div>
         </div>
         <button class="icon-external" is="paper-icon-button-light" actionable
             aria-label="$i18n{additionalFeaturesTitle}"
             aria-describedby="moreFeaturesSecondary"></button>
       </a>
     </template>
   </template>
   <script src="manage_a11y_page.js"></script>
 </dom-module>