fix: add theme data source for devtools. (#44636)

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Bill Shen <shenyb32768@gmail.com>

shell/browser/ui/devtools_ui.h

@@ -14,6 +14,7 @@ class DevToolsUI : public content::WebUIController {
  public:
   explicit DevToolsUI(content::BrowserContext* browser_context,
                       content::WebUI* web_ui);
+  ~DevToolsUI() override = default;
 
   // disable copy
   DevToolsUI(const DevToolsUI&) = delete;