Bug 1587312 - Fix typo of finding non-anonymous content. r=masayuki

Differential Revision: https://phabricator.services.mozilla.com/D48640

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

editor/libeditor/EditorDOMPoint.h

@@ -495,7 +495,7 @@ class EditorDOMPointBase final {
     nsINode* parent;
     for (parent = mParent->GetParentNode();
          parent && parent->IsInNativeAnonymousSubtree();
-         parent = mParent->GetParentNode()) {
+         parent = parent->GetParentNode()) {
     }
     if (!parent) {
       return EditorRawDOMPoint();