Change default button on delete user confirmation page

chrome/browser/resources/sync_setup_overlay.html

 <div id="sync-setup-overlay" class="page" hidden>
   <div class="close-button"></div>
   <div id="sync-setup-configure" hidden>
     <div id="confirm-sync-preferences">
       <h1 i18n-content="confirmSyncPreferences"></h1>
       <div id="sync-instructions-container" class="content-area">
         <span i18n-content="chooseDataTypesInstructions"></span>
         <a id="encryption-help-link" target="_blank"
             i18n-values="href:syncEverythingHelpURL" i18n-content="learnMore">
         </a>
       </div>
       <div>
         <div class="action-area">
           <div class="action-area-link-container">
             <a is="action-link" id="customize-link"
                 i18n-content="customizeLinkLabel"></a>
           </div>
           <div id="confirm-everything-throbber" class="throbber"></div>
           <div class="button-strip">
             <input id="confirm-everything-cancel" type="button"
                 i18n-values="value:cancel">
             <input id="confirm-everything-ok" type="button"
-                i18n-values="value:syncEverything">
+                class="default-button" i18n-values="value:syncEverything">
           </div>
         </div>
       </div>
     </div>
     <div id="customize-sync-preferences" hidden>
       <h1 i18n-content="syncSetupConfigureTitle"></h1>
       <form id="choose-data-types-form">
         <div id="sync-configure-content" class="content-area">
           <div id="sync-select-container">
             <select id="sync-select-datatypes"
@@ skipping 157 matching lines @@
         </div>
         <div class="action-area">
           <div class="action-area-link-container">
             <a is="action-link" id="use-default-link"
                 i18n-content="useDefaultSettings"></a>
           </div>
           <div id="choose-datatypes-throbber" class="throbber"></div>
           <div class="button-strip">
             <input id="choose-datatypes-cancel" type="button"
                 i18n-values="value:cancel">
-            <input id="choose-datatypes-ok" type="submit"
+            <input id="choose-datatypes-ok" type="submit" class="default-button"
                 i18n-values="value:ok">
           </div>
         </div>
       </form>
     </div>
   </div>
   <div id="sync-setup-spinner" hidden>
     <h1 i18n-content="syncSetupSpinnerTitle"></h1>
     <div class="action-area button-strip">
-      <input id="sync-spinner-cancel" type="button" i18n-values="value:cancel">
+      <input id="sync-spinner-cancel" type="button" class="default-button"
+          i18n-values="value:cancel">
     </div>
   </div>
   <div id="sync-setup-timeout" hidden>
     <h1 i18n-content="syncSetupTimeoutTitle"></h1>
     <div class="content-area">
       <span i18n-content="syncSetupTimeoutContent"></span>
     </div>
     <div class="action-area button-strip">
-      <button id="timeout-ok" i18n-content="ok"></button>
+      <button id="timeout-ok" i18n-content="ok" class="default-button"></button>
     </div>
   </div>
   <div id="sync-setup-stop-syncing" hidden>
     <h1 i18n-content="stopSyncingTitle"></h1>
     <div class="content-area">
       <span i18n-values=".innerHTML:stopSyncingExplanation"></span>
 <if expr="(not chromeos and is_posix) or is_win or is_macosx">
       <div id="sync-setup-delete-profile" class="checkbox">
         <label>
           <input id="delete-profile" type="checkbox">
           <span i18n-content="deleteProfileLabel"></span>
         </label>
       </div>
 </if>
     </div>
     <div class="action-area button-strip">
       <input id="stop-syncing-cancel" type="button"
           i18n-values="value:cancel">
-      <input id="stop-syncing-ok" type="button"
+      <input id="stop-syncing-ok" type="button" class="default-button"
           i18n-values="value:stopSyncingConfirm">
     </div>
   </div>
 </div>