[TabUi] Use correct resource ID

Bug: 1017909
Change-Id: I90dd2cbf84d904cc60ea9bf676a5f255839281ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879951
Auto-Submit: Ganggui Tang <gogerald@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709814}

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabSelectionEditorToolbar.java

@@ -38,7 +38,7 @@ class TabSelectionEditorToolbar extends SelectableListToolbar<Integer> {
         super.onFinishInflate();
 
         showNavigationButton();
-        mGroupButton = (Button) findViewById(org.chromium.chrome.R.id.action_button);
+        mGroupButton = (Button) findViewById(R.id.action_button);
         mNumberRollView.setStringForZero(R.string.tab_selection_editor_toolbar_select_tabs);
     }