Converts accNavigate over to the AXPlatformNode code.

ui/views/accessibility/native_view_accessibility_auralinux.cc

Index: ui/views/accessibility/native_view_accessibility_auralinux.cc
diff --git a/ui/views/accessibility/native_view_accessibility_auralinux.cc b/ui/views/accessibility/native_view_accessibility_auralinux.cc
index a5af202bb26472527ac54b1fb9851019f24b2299..e16ba4a95de5f1e8a9ec76cbadbe77d7643060e9 100644
--- a/ui/views/accessibility/native_view_accessibility_auralinux.cc
+++ b/ui/views/accessibility/native_view_accessibility_auralinux.cc
@@ -106,6 +106,8 @@ class AuraLinuxApplication
     return nullptr;
   }
 
+  ui::AXPlatformNode* GetFromNodeID(int32_t id) override { return nullptr; }
+
   gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override {
     return gfx::kNullAcceleratedWidget;
   }