Removing special focus cases for login screen PIN view

Since the PIN view is not focusable anymore, this is dead code.

Bug: 1043194
Change-Id: Ifd3e4cd8427abaca2bebd76187bba488bd2b4ef5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153441Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Thomas Tellier <tellier@google.com>
Cr-Commit-Position: refs/heads/master@{#760997}

ash/login/ui/login_pin_view.cc

@@ -487,21 +487,6 @@ void LoginPinView::NotifyAccessibilityLocationChanged() {
 }
 
 void LoginPinView::OnPasswordTextChanged(bool is_empty) {
-  // Disabling the backspace button or the submit button will make it lose
-  // focus. The previous focusable view is a button in PIN keyboard, which is
-  // slightly more expected than the user menu.
-  if (is_empty) {
-    View* with_focus = nullptr;
-    if (backspace_->HasFocus())
-      with_focus = backspace_;
-    else if (submit_button_->HasFocus())
-      with_focus = submit_button_;
-    if (with_focus) {
-      View* previous = with_focus->GetPreviousFocusableView();
-      if (previous)
-        previous->RequestFocus();
-    }
-  }
   backspace_->SetEnabled(!is_empty);
   submit_button_->SetEnabled(!is_empty);
 }