Test aria-pressed=mixed on windows

content/browser/accessibility/browser_accessibility_manager_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/accessibility/browser_accessibility_manager_mac.h"
 
 #include "base/bind.h"
 #import "base/mac/mac_util.h"
 #import "base/mac/scoped_nsobject.h"
 #import "base/mac/sdk_forward_declarations.h"
@@ skipping 393 matching lines @@
     while (i < old_text.length() && i < new_text.length() &&
            old_text[i] == new_text[i]) {
       ++i;
     }
     size_t length = (old_text.length() - i) - (new_text.length() - i);
     base::string16 deleted_text = old_text.substr(i, length);
     text_edits_[new_node_data.id] = deleted_text;
   }
 }
 
-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]
       autorelease];
   [user_info setObject:@YES forKey:NSAccessibilityTextStateSyncKey];
   [user_info setObject:@(AXTextStateChangeTypeUnknown)
                 forKey:NSAccessibilityTextStateChangeTypeKey];
   [user_info setObject:@(AXTextSelectionDirectionUnknown)
                 forKey:NSAccessibilityTextSelectionDirection];
   [user_info setObject:@(AXTextSelectionGranularityUnknown)
@@ skipping 50 matching lines @@
     NSAccessibilityTextChangeValues : changes,
     NSAccessibilityTextChangeElement : native_node
   };
 }
 
 NSView* BrowserAccessibilityManagerMac::GetParentView() {
   return delegate() ? delegate()->AccessibilityGetAcceleratedWidget() : nullptr;
 }
 
 }  // namespace content