Remove CallExpr.getACallee().

ql/src/semmle/go/Expr.qll

@@ -466,21 +466,6 @@ class CallExpr extends CallOrConversionExpr {
   /** Gets the declared target of this call. */
   Function getTarget() { this = result.getACallExpr() }
 
-  /**
-   * Gets the definition of a possible target of this call.
-   *
-   * For non-virtual calls, there is at most one possible call target (but there may be none if the
-   * target has no declaration).
-   *
-   * For virtual calls, we look up possible targets in all types that implement the receiver
-   * interface type.
-   */
-  FuncDef getACallee() {
-    exists(DataFlow::CallNode call | call.asExpr() = this |
-      result = call.getACallee()
-    )
-  }
-
   override predicate mayHaveOwnSideEffects() {
     getTarget().mayHaveSideEffects() or
     not exists(getTarget())

ql/src/semmle/go/dataflow/internal/DataFlowDispatch.qll

@@ -7,7 +7,9 @@ DataFlowCallable viableImpl(DataFlowCall ma) { result = viableCallable(ma) }
  * Gets a function that might be called by `call`.
  */
 DataFlowCallable viableCallable(CallExpr ma) {
-  result = ma.getACallee()
+  exists(DataFlow::CallNode c | c.asExpr() = ma |
+    result = c.getACallee()
+  )
 }
 
 /**