[MD settings] removing secondary-button class

chrome/browser/resources/settings/about_page/about_page.html

Index: chrome/browser/resources/settings/about_page/about_page.html
diff --git a/chrome/browser/resources/settings/about_page/about_page.html b/chrome/browser/resources/settings/about_page/about_page.html
index 6d9ee1806ac27bdd625dd3c322e3f6a39d9f6be6..5211e8c5f75cae51ba67cf22c3ce608f2ece8bbe 100644
--- a/chrome/browser/resources/settings/about_page/about_page.html
+++ b/chrome/browser/resources/settings/about_page/about_page.html
@@ -127,17 +127,17 @@
               </div>
               <div class="separator" hidden="[[!showButtonContainer_]]"></div>
               <span id="buttonContainer" hidden="[[!showButtonContainer_]]">
-                <paper-button id="relaunch" class="secondary-button"
-                    hidden="[[!showRelaunch_]]" on-tap="onRelaunchTap_">
+                <paper-button id="relaunch" hidden="[[!showRelaunch_]]"
+                    on-tap="onRelaunchTap_">
                   $i18n{aboutRelaunch}
                 </paper-button>
 <if expr="chromeos">
-                <paper-button id="relaunchAndPowerwash" class="secondary-button"
+                <paper-button id="relaunchAndPowerwash"
                     hidden="[[!showRelaunchAndPowerwash_]]"
                     on-tap="onRelaunchAndPowerwashTap_">
                   $i18n{aboutRelaunchAndPowerwash}
                 </paper-button>
-                <paper-button id="checkForUpdates" class="secondary-button"
+                <paper-button id="checkForUpdates"
                     hidden="[[!showCheckUpdates_]]"
                     on-tap="onCheckUpdatesTap_">
                   $i18n{aboutCheckForUpdates}