Test aria-pressed=mixed on windows

content/browser/accessibility/browser_accessibility_manager_mac.mm

Index: content/browser/accessibility/browser_accessibility_manager_mac.mm
diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.mm b/content/browser/accessibility/browser_accessibility_manager_mac.mm
index 51f453f678c19d9f1fcff1a0292c296d98618048..11ffb68ecca297d1152e3ff07adf06562f548361 100644
--- a/content/browser/accessibility/browser_accessibility_manager_mac.mm
+++ b/content/browser/accessibility/browser_accessibility_manager_mac.mm
@@ -411,18 +411,6 @@ void BrowserAccessibilityManagerMac::OnNodeDataWillChange(
   }
 }
 
-void BrowserAccessibilityManagerMac::OnStateChanged(ui::AXTree* tree,
-                                                    ui::AXNode* ax_node,
-                                                    ui::AXState state,
-                                                    bool new_value) {
-  if (state != ui::AX_STATE_PRESSED)
-    return;
-
-  BrowserAccessibility* node = GetFromID(ax_node->id());
-  NotifyAccessibilityEvent(BrowserAccessibilityEvent::FromTreeChange,
-                           ui::AX_EVENT_CHECKED_STATE_CHANGED, node);
-}
-
 NSDictionary* BrowserAccessibilityManagerMac::
     GetUserInfoForSelectedTextChangedNotification() {
   NSMutableDictionary* user_info = [[[NSMutableDictionary alloc] init]