Migrate BrowserAccessibility windows unique id handling to AXPlatformNodeWin.

ui/accessibility/platform/ax_platform_node_win.cc

 // Copyright 2015 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 <atlbase.h>
 #include <atlcom.h>
 #include <limits.h>
 #include <oleacc.h>
 #include <stdint.h>
 
@@ skipping 222 matching lines @@
   // Menu items fire selection events but Windows screen readers work reliably
   // with focus events. Remap here.
   if (event_type == ui::AX_EVENT_SELECTION &&
       GetData().role == ui::AX_ROLE_MENU_ITEM)
     event_type = ui::AX_EVENT_FOCUS;
 
   int native_event = MSAAEvent(event_type);
   if (native_event < EVENT_MIN)
     return;
 
-  ::NotifyWinEvent(native_event, hwnd, OBJID_CLIENT, -unique_id_);
+  ::NotifyWinEvent(native_event, hwnd, OBJID_CLIENT, -unique_id());
 
   // Keep track of objects that are a target of an alert event.
   if (event_type == ui::AX_EVENT_ALERT)
     AddAlertTarget();
 }
 
 int AXPlatformNodeWin::GetIndexInParent() {
   base::win::ScopedComPtr<IDispatch> parent_dispatch;
   base::win::ScopedComPtr<IAccessible> parent_accessible;
   if (S_OK != get_accParent(parent_dispatch.GetAddressOf()))
@@ skipping 553 matching lines @@
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_states(AccessibleStates* states) {
   COM_OBJECT_VALIDATE_1_ARG(states);
   *states = IA2State();
   return S_OK;
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_uniqueID(LONG* unique_id) {
   COM_OBJECT_VALIDATE_1_ARG(unique_id);
-  *unique_id = -unique_id_;
+  *unique_id = -AXPlatformNode::unique_id();
   return S_OK;
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_windowHandle(HWND* window_handle) {
   COM_OBJECT_VALIDATE_1_ARG(window_handle);
   *window_handle = delegate_->GetTargetForNativeAccessibilityEvent();
   return *window_handle ? S_OK : S_FALSE;
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_relationTargetsOfType(
@@ skipping 1932 matching lines @@
   if (container && container->GetData().role == ui::AX_ROLE_GROUP)
     container = FromNativeViewAccessible(container->GetParent());
 
   if (!container)
     return false;
 
   return container->GetData().role == ui::AX_ROLE_TREE_GRID;
 }
 
 }  // namespace ui