[Extensions] Add more bindings access checks

BUG=598165

Review URL: https://codereview.chromium.org/1854983002

Cr-Commit-Position: refs/heads/master@{#385282}
void AutomationInternalCustomBindings::OnNodeChanged(ui::AXTree* tree,
                                                     ui::AXNode* node) {
}

void AutomationInternalCustomBindings::OnNodeChanged(ui::AXTree* tree,
                                                     ui::AXNode* node) {
}
