Convert toolbar_subtrees_jsonp() to a Controller

There we go.

+++ b/core/modules/toolbar/toolbar.moduleundefined
@@ -59,20 +59,6 @@ function toolbar_theme($existing, $type, $theme, $path) {
-    'page callback' => 'toolbar_subtrees_jsonp',

i cant see this callback deleted.is it used elsewhere?

+++ b/core/modules/toolbar/toolbar.moduleundefined
@@ -130,7 +116,7 @@ function toolbar_element_info() {
 function _toolbar_subtrees_access($hash) {

any reason you kept this?:)

Thanks for the review!

I wanted to keep the patch as small as possible, just kidding ;)

haha, smaller patches, easier to review:P

+++ b/core/modules/toolbar/lib/Drupal/toolbar/Routing/ToolbarController.phpundefined
@@ -0,0 +1,30 @@
+  public function subtreesJSONP() {

nitpick time then: i am not 100% sure about the naming of this method.shouldn't it be sunbtreeJsonp :)

There we go.

looks great now, thanks!

Committed a5e363a and pushed to 8.x. Thanks!