Remove use of deprecated base::ListValue::Append(Value*) overload in extensions.

chrome/browser/extensions/browser_extension_window_controller.h

Index: chrome/browser/extensions/browser_extension_window_controller.h
diff --git a/chrome/browser/extensions/browser_extension_window_controller.h b/chrome/browser/extensions/browser_extension_window_controller.h
index 29addae0213f2630d473109006482be373db5178..86545fdf4d90c2e82539b217958906de65b8ac1b 100644
--- a/chrome/browser/extensions/browser_extension_window_controller.h
+++ b/chrome/browser/extensions/browser_extension_window_controller.h
@@ -24,8 +24,6 @@ class BrowserExtensionWindowController : public extensions::WindowController {
   std::string GetWindowTypeText() const override;
   std::unique_ptr<base::DictionaryValue> CreateWindowValueWithTabs(
       const extensions::Extension* extension) const override;
-  base::DictionaryValue* CreateTabValue(const extensions::Extension* extension,
-                                        int tab_index) const override;
   std::unique_ptr<extensions::api::tabs::Tab> CreateTabObject(
       const extensions::Extension* extension,
       int tab_index) const override;