[Extensions] Short-circuit activity logging if not enabled

extensions/browser/api/extensions_api_client.h

Index: extensions/browser/api/extensions_api_client.h
diff --git a/extensions/browser/api/extensions_api_client.h b/extensions/browser/api/extensions_api_client.h
index af8054021119ac59499303f2c41a896ab3fbbd69..126b6e0f86f40298580195067ae17a9a2d6bcd1b 100644
--- a/extensions/browser/api/extensions_api_client.h
+++ b/extensions/browser/api/extensions_api_client.h
@@ -107,8 +107,8 @@ class ExtensionsAPIClient {
       WebViewPermissionHelper* web_view_permission_helper) const;
 
   // Creates a delegate for WebRequestEventRouter.
-  virtual WebRequestEventRouterDelegate* CreateWebRequestEventRouterDelegate()
-      const;
+  virtual std::unique_ptr<WebRequestEventRouterDelegate>
+  CreateWebRequestEventRouterDelegate() const;
 
   // TODO(wjmaclean): Remove this when (if) ContentRulesRegistry code moves
   // to extensions/browser/api.