[a11y] Remove ui:: usage within the ui namespace for ui/accessibility

In CL:5520052 I moved many files from //content/accessibility to
//ui/accessibility/platform and to reduce diff in that CL, I deferred
removing the redundant ui:: namespace specifier when we are already in
the ui namespace.

While those moved files have been addressed by a prior change, this
CL does the same for the remainder of the ui/accessibility
directory.


Bug: 40672441
Change-Id: Iee9407c7c47f55e1b0593fdbc743cb6fedd5f7fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5805625
Auto-Submit: Jacques Newman <[email protected]>
Commit-Queue: Jacques Newman <[email protected]>
Reviewed-by: Aaron Leventhal <[email protected]>
Reviewed-by: Elly FJ <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1348345}
diff --git a/ui/accessibility/ax_action_handler_base.h b/ui/accessibility/ax_action_handler_base.h
index 81ce8c7..536333a 100644
--- a/ui/accessibility/ax_action_handler_base.h
+++ b/ui/accessibility/ax_action_handler_base.h
@@ -36,11 +36,11 @@
   const AXTreeID& ax_tree_id() const { return tree_id_; }
 
  protected:
-  // Initializes the AXActionHandlerBase subclass with ui::AXTreeIDUnknown().
+  // Initializes the AXActionHandlerBase subclass with AXTreeIDUnknown().
   AXActionHandlerBase();
 
   // Initializes the AXActionHandlerBase subclass with |ax_tree_id|. It is Ok to
-  // pass ui::AXTreeIDUnknown() and then call SetAXTreeID() at a later point.
+  // pass AXTreeIDUnknown() and then call SetAXTreeID() at a later point.
   explicit AXActionHandlerBase(const AXTreeID& ax_tree_id);
 
   // Change the AXTreeID.