[Extensions]: Fix scrollable devDrawer on extensions page (#23557)

browser/resources/extensions/brave_overrides/extensions_toolbar.ts

@@ -0,0 +1,13 @@
+// Copyright (c) 2024 The Brave Authors. All rights reserved.
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import { RegisterStyleOverride } from '//resources/brave/polymer_overriding.js'
+import { html } from '//resources/polymer/v3_0/polymer/polymer_bundled.min.js'
+
+RegisterStyleOverride('extensions-toolbar', html`<style>
+  :host #devDrawer {
+    overflow: hidden;
+  }
+</style>`)

browser/resources/extensions/brave_overrides/index.ts

@@ -4,4 +4,5 @@
 // you can obtain one at https://mozilla.org/MPL/2.0/.
 
 import './extensions_detail_view.js'
+import './extensions_toolbar.js'
 import './side_bar.js'

browser/resources/extensions/sources.gni

@@ -7,6 +7,7 @@ brave_extensions_web_component_files = [ "brave_item_list_more_items.ts" ]
 
 brave_extensions_non_web_component_files = [
   "brave_overrides/extensions_detail_view.ts",
+  "brave_overrides/extensions_toolbar.ts",
   "brave_overrides/index.ts",
   "brave_overrides/side_bar.ts",
 ]