[MD settings] removing secondary-button class

chrome/browser/resources/settings/android_apps_page/android_apps_page.html

 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button-light.html">
 <link rel="import" href="../i18n_setup.html">
 <link rel="import" href="../prefs/prefs_behavior.html">
 <link rel="import" href="../settings_page/settings_animated_pages.html">
 <link rel="import" href="../settings_page/settings_subpage.html">
@@ skipping 20 matching lines @@
               icon-aria-label="$i18n{androidAppsPageTitle}">
           </cr-policy-pref-indicator>
           <template is="dom-if" if="[[androidAppsInfo_.playStoreEnabled]]">
             <button class="subpage-arrow" is="paper-icon-button-light"
                 aria-label="$i18n{androidAppsPageTitle}"
                 aria-describedby="secondaryText">
             </button>
           </template>
           <template is="dom-if" if="[[!androidAppsInfo_.playStoreEnabled]]">
             <div class="separator"></div>
-            <paper-button id="enable" class="secondary-button"
-                on-tap="onEnableTap_"
+            <paper-button id="enable" on-tap="onEnableTap_"
                 aria-label="$i18n{androidAppsPageTitle}"
                 aria-describedby="secondaryText">
               $i18n{androidAppsEnable}
             </paper-button>
           </template>
         </div>
       </neon-animatable>
 
       <template is="dom-if" route-path="/androidApps/details">
         <settings-subpage
             associated-control="[[$$('#android-apps')]]"
             page-title="$i18n{androidAppsPageLabel}">
           <settings-android-apps-subpage
               android-apps-info="[[androidAppsInfo_]]" prefs="{{prefs}}">
           </settings-android-apps-subpage>
         </settings-subpage>
       </template>
     </settings-animated-pages>
 
   </template>
   <script src="android_apps_page.js"></script>
 </dom-module>