[Extensions] Short-circuit activity logging if not enabled

extensions/browser/api/extensions_api_client.cc

Index: extensions/browser/api/extensions_api_client.cc
diff --git a/extensions/browser/api/extensions_api_client.cc b/extensions/browser/api/extensions_api_client.cc
index 18ee9d63db07e2a052f145d8b4ca136d14d1b100..954e5e3fceb22c70be8b0fe582d70dd8daaa6c4f 100644
--- a/extensions/browser/api/extensions_api_client.cc
+++ b/extensions/browser/api/extensions_api_client.cc
@@ -71,9 +71,9 @@ WebViewPermissionHelperDelegate* ExtensionsAPIClient::
   return new WebViewPermissionHelperDelegate(web_view_permission_helper);
 }
 
-WebRequestEventRouterDelegate*
+std::unique_ptr<WebRequestEventRouterDelegate>
 ExtensionsAPIClient::CreateWebRequestEventRouterDelegate() const {
-  return new WebRequestEventRouterDelegate();
+  return nullptr;
 }
 
 scoped_refptr<ContentRulesRegistry>