[MD settings] removing secondary-button class

chrome/browser/resources/settings/people_page/people_page.html

 <link rel="import" href="chrome://resources/cr_elements/cr_dialog/cr_dialog.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_expand_button/cr_expand_button.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/assert.html">
 <link rel="import" href="chrome://resources/html/cr/ui/focus_without_ink.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/icon.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/util.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
@@ skipping 116 matching lines @@
 <if expr="not chromeos">
             <template is="dom-if" if="[[showSignin_(syncStatus)]]">
               <div class="separator"></div>
               <paper-button class="primary-button" on-tap="onSigninTap_"
                   disabled="[[syncStatus.setupInProgress]]">
                 $i18n{syncSignin}
               </paper-button>
             </template>
             <template is="dom-if" if="[[syncStatus.signedIn]]">
               <div class="separator"></div>
-              <paper-button id="disconnectButton" class="secondary-button"
-                  on-tap="onDisconnectTap_"
+              <paper-button id="disconnectButton" on-tap="onDisconnectTap_"
                   disabled="[[syncStatus.setupInProgress]]">
                 $i18n{syncDisconnect}
               </paper-button>
             </template>
 </if>
           </template>
         </div>
         <div class="settings-box two-line"
             hidden="[[!showSignin_(syncStatus)]]">
           <div>
@@ skipping 183 matching lines @@
 
     <template is="dom-if" if="[[showImportDataDialog_]]" restamp>
       <settings-import-data-dialog prefs="{{prefs}}"
           on-close="onImportDataDialogClosed_">
       </settings-import-data-dialog>
     </template>
 
   </template>
   <script src="people_page.js"></script>
 </dom-module>