[cpp20] Fix incompatible aggregate initialization (#38165)

* [cpp20] Fix incompatible aggregate initialization

* Update third_party/accessibility/ax/ax_tree_update.h

Co-authored-by: Chris Bracken <chris@bracken.jp>

* Update third_party/accessibility/ax/ax_tree_update.h

Co-authored-by: Chris Bracken <chris@bracken.jp>

Co-authored-by: Chris Bracken <chris@bracken.jp>

third_party/accessibility/ax/ax_tree_update.h

diff --git a/third_party/accessibility/ax/ax_tree_update.h b/third_party/accessibility/ax/ax_tree_update.h
index e0b895f..e091c4e 100644
--- a/third_party/accessibility/ax/ax_tree_update.h
+++ b/third_party/accessibility/ax/ax_tree_update.h
@@ -50,9 +50,6 @@
 //        before or after an AXTreeUpdate.
 template <typename AXNodeData, typename AXTreeData>
 struct AXTreeUpdateBase {
-  AXTreeUpdateBase() = default;
-  ~AXTreeUpdateBase() = default;
-
   // If |has_tree_data| is true, the value of |tree_data| should be used
   // to update the tree data, otherwise it should be ignored.
   bool has_tree_data = false;