Address review comments

Author: owen-mc

go/ql/lib/semmle/go/dataflow/internal/DataFlowPrivate.qll

@@ -192,7 +192,9 @@ predicate clearsContent(Node n, Content c) {
  * Holds if the value that is being tracked is expected to be stored inside content `c`
  * at node `n`.
  */
-predicate expectsContent(Node n, ContentSet c) { none() }
+predicate expectsContent(Node n, ContentSet c) {
+  FlowSummaryImpl::Private::Steps::summaryExpectsContent(n, c)
+}
 
 /** Gets the type of `n` used for type pruning. */
 DataFlowType getNodeType(Node n) {

go/ql/lib/semmle/go/dataflow/internal/FlowSummaryImplSpecific.qll

@@ -61,7 +61,9 @@ DataFlowType getCallbackReturnType(DataFlowType t, ReturnKind rk) { none() }
  * `input`, output specification `output`, kind `kind`, and a flag `generated`
  * stating whether the summary is autogenerated.
  */
-predicate summaryElement(Callable c, string input, string output, string kind, boolean generated) {
+predicate summaryElement(
+  SummarizedCallableBase c, string input, string output, string kind, boolean generated
+) {
   exists(
     string namespace, string type, boolean subtypes, string name, string signature, string ext
   |