Possible deferencing from nullptrs in AtkComponent interface.

ui/accessibility/platform/ax_platform_node_auralinux.h

Index: ui/accessibility/platform/ax_platform_node_auralinux.h
diff --git a/ui/accessibility/platform/ax_platform_node_auralinux.h b/ui/accessibility/platform/ax_platform_node_auralinux.h
index 14c168e424a79153179296ff97365706387ef430..1c1fd8a6c98d7cd3b49e70480525c64d40c57ec1 100644
--- a/ui/accessibility/platform/ax_platform_node_auralinux.h
+++ b/ui/accessibility/platform/ax_platform_node_auralinux.h
@@ -39,6 +39,10 @@ class AXPlatformNodeAuraLinux : public AXPlatformNodeBase {
   void GetPosition(gint* x, gint* y, AtkCoordType coord_type);
   void GetSize(gint* width, gint* height);
 
+  void SetExtentsRelativeToAtkCoordinateType(
+      gint* x, gint* y, gint* width, gint* height,
+      AtkCoordType coord_type);
+
   // AXPlatformNode overrides.
   void Destroy() override;
   gfx::NativeViewAccessible GetNativeViewAccessible() override;