Remove const from MergeAXTreeUpdates param.

Follow up work for crrev.com/c/6399194

Bug: 406533891
Change-Id: Idfeb71766cd22d6c9a99b83ac177aa741d0c4d6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6409956
Reviewed-by: David Tseng <[email protected]>
Reviewed-by: Rakina Zata Amni <[email protected]>
Commit-Queue: Lauren Winston <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1450367}
diff --git a/ui/accessibility/ax_tree_update_util.h b/ui/accessibility/ax_tree_update_util.h
index 0c3e5fa..18d90af 100644
--- a/ui/accessibility/ax_tree_update_util.h
+++ b/ui/accessibility/ax_tree_update_util.h
@@ -22,7 +22,7 @@
 //
 // Merging tree updates helps minimize the overhead of calling
 // Unserialize multiple times.
-AX_EXPORT bool MergeAXTreeUpdates(const std::vector<AXTreeUpdate>& src,
+AX_EXPORT bool MergeAXTreeUpdates(std::vector<AXTreeUpdate>& src,
                                   std::vector<AXTreeUpdate>* dst);
 
 }  // namespace ui