Converts accNavigate over to the AXPlatformNode code.

ui/accessibility/platform/ax_system_caret_win.cc

Index: ui/accessibility/platform/ax_system_caret_win.cc
diff --git a/ui/accessibility/platform/ax_system_caret_win.cc b/ui/accessibility/platform/ax_system_caret_win.cc
index bd6b7e66ae420f50baa4e8135a7eaeb18fdb7f5d..d09bc04b8f7a36898805620d79e6742eab7533ab 100644
--- a/ui/accessibility/platform/ax_system_caret_win.cc
+++ b/ui/accessibility/platform/ax_system_caret_win.cc
@@ -108,6 +108,10 @@ bool AXSystemCaretWin::AccessibilityPerformAction(
   return false;
 }
 
+AXPlatformNode* AXSystemCaretWin::GetFromNodeID(int32_t id) {
+  return nullptr;
+}
+
 bool AXSystemCaretWin::ShouldIgnoreHoveredStateForTesting() {
   return false;
 }