[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.cc b/ui/accessibility/ax_action_handler_base.cc
index caff4ae9..4a6d8d768 100644
--- a/ui/accessibility/ax_action_handler_base.cc
+++ b/ui/accessibility/ax_action_handler_base.cc
@@ -13,7 +13,7 @@
 }
 
 AXActionHandlerBase::AXActionHandlerBase()
-    : AXActionHandlerBase(ui::AXTreeIDUnknown()) {}
+    : AXActionHandlerBase(AXTreeIDUnknown()) {}
 
 AXActionHandlerBase::AXActionHandlerBase(const AXTreeID& ax_tree_id)
     : tree_id_(ax_tree_id) {}
@@ -23,7 +23,7 @@
 }
 
 void AXActionHandlerBase::SetAXTreeID(AXTreeID new_ax_tree_id) {
-  DCHECK_NE(new_ax_tree_id, ui::AXTreeIDUnknown());
+  DCHECK_NE(new_ax_tree_id, AXTreeIDUnknown());
   AXActionHandlerRegistry::GetInstance()->RemoveAXTreeID(tree_id_);
   tree_id_ = new_ax_tree_id;
   AXActionHandlerRegistry::GetInstance()->SetAXTreeID(tree_id_, this);