Bug 1572955 - Remove devtools toolbar button in browser_984455_bookmarks_items_reparenting.js to get same available toolbar space across branches. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D42483

--HG--
extra : moz-landing-system : lando

browser/components/customizableui/test/browser_984455_bookmarks_items_reparenting.js

@@ -205,6 +205,9 @@ function checkNotOverflowing(aID) {
  */
 add_task(async function testOverflowingBookmarksButtonContextMenu() {
   ok(CustomizableUI.inDefaultState, "Should start in default state.");
+  // The DevEdition has the DevTools button in the toolbar by default. Remove it
+  // to prevent branch-specific available toolbar space.
+  CustomizableUI.removeWidgetFromArea("developer-button");
   CustomizableUI.removeWidgetFromArea(
     "library-button",
     CustomizableUI.AREA_NAVBAR