Force AXPlatformNode to have the same unique id as the owning BA object.

content/browser/accessibility/browser_accessibility_com_win.cc

Index: content/browser/accessibility/browser_accessibility_com_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_com_win.cc b/content/browser/accessibility/browser_accessibility_com_win.cc
index 8123f10421f5af4d7f0213791594e4df3705d6ef..d8b3e7506a4aba744fb3e29be0326c8364084aa1 100644
--- a/content/browser/accessibility/browser_accessibility_com_win.cc
+++ b/content/browser/accessibility/browser_accessibility_com_win.cc
@@ -4105,6 +4105,12 @@ void BrowserAccessibilityComWin::Init(ui::AXPlatformNodeDelegate* delegate) {
   AXPlatformNodeBase::Init(delegate);
 }
 
+ui::AXPlatformNode* BrowserAccessibilityComWin::GetFromUniqueId(
+    int32_t unique_id) {
+  return ToBrowserAccessibilityComWin(
+      BrowserAccessibility::GetFromUniqueID(unique_id));
+}
+
 std::vector<base::string16> BrowserAccessibilityComWin::ComputeTextAttributes()
     const {
   std::vector<base::string16> attributes;