Remove ChromeOS workaround for window activate and deactivate events

Bug: 866336
Change-Id: I4e59974ee8f11cd789720b587d2954d7e3086168
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1309654
Commit-Queue: Martin Robinson <mrobinson@igalia.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703369}

chrome/browser/ui/aura/accessibility/automation_manager_aura.cc

@@ -83,16 +83,6 @@ void AutomationManagerAura::OnViewEvent(views::View* view,
   if (!obj)
     return;
 
-  // Ignore toplevel window activate and deactivate events. These are causing
-  // issues with ChromeOS accessibility tests and are currently only used on
-  // desktop Linux platforms.
-  // TODO(https://crbug.com/89717): Need to harmonize the firing of
-  // accessibility events between platforms.
-  if (event_type == ax::mojom::Event::kWindowActivated ||
-      event_type == ax::mojom::Event::kWindowDeactivated) {
-    return;
-  }
-
   // Post a task to handle the event at the end of the current call stack.
   // This helps us avoid firing accessibility events for transient changes.
   // because there's a chance that the underlying object being wrapped could