Delete unused button css

app/assets/javascripts/notes/components/diff_with_note.vue

@@ -107,7 +107,7 @@ export default {
           <td v-if="error" class="js-error-lazy-load-diff diff-loading-error-block">
             {{ __('Unable to load the diff') }}
             <button
-              class="btn-link btn-link-retry btn-no-padding js-toggle-lazy-diff-retry-button"
+              class="btn-link btn-link-retry gl-p-0 js-toggle-lazy-diff-retry-button"
               @click="fetchDiff"
             >
               {{ __('Try again') }}

app/assets/stylesheets/framework/buttons.scss

@@ -158,12 +158,6 @@
     line-height: $gl-btn-small-line-height;
   }
 
-  &.btn-xs {
-    padding: 2px $gl-btn-padding;
-    font-size: $gl-btn-xs-font-size;
-    line-height: $gl-btn-xs-line-height;
-  }
-
   &.btn-success {
     @include btn-green;
   }
@@ -438,10 +432,6 @@ fieldset[disabled] .btn,
   cursor: default;
 }
 
-.btn-no-padding {
-  padding: 0;
-}
-
 // This class helps convert `.gl-button` children so that they consistently
 // match the style of `.btn` elements which might be around them. Ideally we
 // wouldn't need this class.

app/assets/stylesheets/framework/variables.scss

@@ -589,8 +589,6 @@ $gl-btn-vert-padding: 8px;
 $gl-btn-horz-padding: 12px;
 $gl-btn-small-font-size: 13px;
 $gl-btn-small-line-height: 18px;
-$gl-btn-xs-font-size: 13px;
-$gl-btn-xs-line-height: 13px;
 
 /*
 * Badges

app/views/discussions/_diff_with_notes.html.haml

@@ -29,7 +29,7 @@
             %td.line_content.js-success-lazy-load
               .js-code-placeholder
             %td.js-error-lazy-load-diff.hidden.diff-loading-error-block
-              - button = button_tag(_("Try again"), class: "btn-link gl-button btn-link-retry btn-no-padding js-toggle-lazy-diff-retry-button")
+              - button = button_tag(_("Try again"), class: "btn-link gl-button btn-link-retry gl-p-0 js-toggle-lazy-diff-retry-button")
               = _("Unable to load the diff. %{button_try_again}").html_safe % { button_try_again: button}
           = render "discussions/diff_discussion", discussions: [discussion], expanded: true
   - else