Data flow: Remove deprecated predicates.

cf github/codeql#3515

Author: Max Schaefer

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

@@ -66,9 +66,6 @@ abstract class Configuration extends string {
    */
   predicate isBarrier(Node node) { none() }
 
-  /** DEPRECATED: override `isBarrierIn` and `isBarrierOut` instead. */
-  deprecated predicate isBarrierEdge(Node node1, Node node2) { none() }
-
   /** Holds if data flow into `node` is prohibited. */
   predicate isBarrierIn(Node node) { none() }
 

ql/src/semmle/go/dataflow/internal/tainttracking1/TaintTrackingImpl.qll

@@ -79,13 +79,6 @@ abstract class Configuration extends DataFlow::Configuration {
     defaultTaintBarrier(node)
   }
 
-  /** DEPRECATED: override `isSanitizerIn` and `isSanitizerOut` instead. */
-  deprecated predicate isSanitizerEdge(DataFlow::Node node1, DataFlow::Node node2) { none() }
-
-  deprecated final override predicate isBarrierEdge(DataFlow::Node node1, DataFlow::Node node2) {
-    isSanitizerEdge(node1, node2)
-  }
-
   /** Holds if data flow into `node` is prohibited. */
   predicate isSanitizerIn(DataFlow::Node node) { none() }