Migrate BrowserAccessibility windows unique id handling to AXPlatformNodeWin.

ui/accessibility/platform/ax_platform_node_win.cc

Index: ui/accessibility/platform/ax_platform_node_win.cc
diff --git a/ui/accessibility/platform/ax_platform_node_win.cc b/ui/accessibility/platform/ax_platform_node_win.cc
index ca9ef23a165e5e247c421f5fa581a03b3787fa71..e957d55894f3441024ae0069828a84608280e0b5 100644
--- a/ui/accessibility/platform/ax_platform_node_win.cc
+++ b/ui/accessibility/platform/ax_platform_node_win.cc
@@ -240,7 +240,7 @@ void AXPlatformNodeWin::NotifyAccessibilityEvent(ui::AXEvent 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)
@@ -814,7 +814,7 @@ STDMETHODIMP AXPlatformNodeWin::get_states(AccessibleStates* states) {
 
 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;
 }