Move versions icon to CSS

Moved the versions icon to CSS to reduce the transfer size

Changelog: performance

app/assets/stylesheets/framework/files.scss

@@ -509,6 +509,24 @@ span.idiff {
   }
 }
 
+.version-link {
+  @include gl-display-inline-block;
+  @include gl-align-self-center;
+  @include gl-mt-2;
+  @include gl-w-5;
+  @include gl-h-5;
+  @include gl-float-left;
+  background-color: $gray-400;
+  mask-image: asset_url('icons-stacked.svg#doc-versions');
+  mask-repeat: no-repeat;
+  mask-size: cover;
+  mask-position: center;
+
+  &:hover {
+    background-color: $black;
+  }
+}
+
 //
 // IMPORTANT PERFORMANCE OPTIMIZATION BELOW
 //

app/presenters/gitlab/blame_presenter.rb

@@ -66,17 +66,14 @@ module Gitlab
       link_to project_blame_path(project, tree_join(previous_commit_id, path)),
         title: _('View blame prior to this change'),
         aria: { label: _('View blame prior to this change') },
+        class: 'version-link',
         data: { toggle: 'tooltip', placement: 'right', container: 'body' } do
-          versions_sprite_icon
+          ' '.html_safe
         end
     end
 
     def project_duration
       @project_duration ||= age_map_duration(groups, project)
     end
-
-    def versions_sprite_icon
-      @versions_sprite_icon ||= sprite_icon('doc-versions', css_class: 'doc-versions align-text-bottom')
-    end
   end
 end