Remove draft_accept_selection_after_refocus flag

Summary: Don't need this any more. Chrome 60 is out.

Reviewed By: zpao

Differential Revision: D5674557

fbshipit-source-id: 878f620f6e91aa1271d13ffa644cd47540b21e76

src/component/handlers/edit/editOnFocus.js

@@ -14,8 +14,8 @@
 
 import type DraftEditor from 'DraftEditor.react';
 
-var DraftFeatureFlags = require('DraftFeatureFlags');
 var EditorState = require('EditorState');
+var UserAgent = require('UserAgent');
 
 function editOnFocus(editor: DraftEditor, e: SyntheticFocusEvent<>): void {
   var editorState = editor._latestEditorState;
@@ -34,10 +34,13 @@ function editOnFocus(editor: DraftEditor, e: SyntheticFocusEvent<>): void {
   // selection here instead of simply accepting it in order to preserve the
   // old cursor position. See https://crbug.com/540004.
   // But it looks like this is fixed in Chrome 60.0.3081.0.
-  if (DraftFeatureFlags.draft_accept_selection_after_refocus) {
-    editor.update(EditorState.acceptSelection(editorState, selection));
-  } else {
+  // Other browsers also don't have this bug, so we prefer to acceptSelection
+  // when possible, to ensure that unfocusing and refocusing a Draft editor
+  // doesn't preserve the selection, matching how textareas work.
+  if (UserAgent.isBrowser('Chrome < 60.0.3081.0')) {
     editor.update(EditorState.forceSelection(editorState, selection));
+  } else {
+    editor.update(EditorState.acceptSelection(editorState, selection));
   }
 }
 

src/component/utils/DraftFeatureFlags-core.js

@@ -13,7 +13,6 @@
 'use strict';
 
 var DraftFeatureFlags = {
-  draft_accept_selection_after_refocus: false,
   draft_killswitch_allow_nontextnodes: false,
   draft_segmented_entities_behavior: false,
 };