Fixed IAccessible::accNavigate for NAVDIR_NEXT and NAVDIR_PREVIOUS when start object was a simple c…

ui/accessibility/platform/test_ax_node_wrapper.cc

Index: ui/accessibility/platform/test_ax_node_wrapper.cc
diff --git a/ui/accessibility/platform/test_ax_node_wrapper.cc b/ui/accessibility/platform/test_ax_node_wrapper.cc
index 6f918c29e3631b0fbfd2c1f61e0e4717678a1baf..28cd793796caf71e1b30d7180746553a25dfd297 100644
--- a/ui/accessibility/platform/test_ax_node_wrapper.cc
+++ b/ui/accessibility/platform/test_ax_node_wrapper.cc
@@ -49,9 +49,7 @@ TestAXTreeDelegate g_ax_tree_delegate;
 
 // static
 TestAXNodeWrapper* TestAXNodeWrapper::GetOrCreate(AXTree* tree, AXNode* node) {
-  // Just return NULL if |node| is NULL; this makes test code simpler because
-  // now we don't have to null-check AXNode* every time we call GetOrCreate.
-  if (!node)
+  if (!tree || !node)
     return nullptr;
 
   tree->SetDelegate(&g_ax_tree_delegate);