delete old code that only existed to support a deleted deprecated feature

Author: erik-krogh

javascript/ql/lib/semmle/javascript/dataflow/TypeTracking.qll

@@ -449,44 +449,3 @@ module SharedTypeTrackingStep {
     any(SharedTypeTrackingStep s).withoutPropStep(pred, succ, props)
   }
 }
-
-// Internal version of AdditionalTypeTrackingStep that we can reference without deprecation warnings.
-abstract private class LegacyTypeTrackingStep extends DataFlow::Node {
-  /**
-   * Holds if type-tracking should step from `pred` to `succ`.
-   */
-  predicate step(DataFlow::Node pred, DataFlow::Node succ) { none() }
-
-  /**
-   * Holds if type-tracking should step from `pred` into the `prop` property of `succ`.
-   */
-  predicate storeStep(DataFlow::Node pred, DataFlow::SourceNode succ, string prop) { none() }
-
-  /**
-   * Holds if type-tracking should step from the `prop` property of `pred` to `succ`.
-   */
-  predicate loadStep(DataFlow::Node pred, DataFlow::Node succ, string prop) { none() }
-
-  /**
-   * Holds if type-tracking should step from the `prop` property of `pred` to the same property in `succ`.
-   */
-  predicate loadStoreStep(DataFlow::Node pred, DataFlow::SourceNode succ, string prop) { none() }
-}
-
-private class LegacyStepAsSharedTypeTrackingStep extends SharedTypeTrackingStep {
-  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
-    any(LegacyTypeTrackingStep s).step(pred, succ)
-  }
-
-  override predicate storeStep(DataFlow::Node pred, DataFlow::SourceNode succ, string prop) {
-    any(LegacyTypeTrackingStep s).storeStep(pred, succ, prop)
-  }
-
-  override predicate loadStep(DataFlow::Node pred, DataFlow::Node succ, string prop) {
-    any(LegacyTypeTrackingStep s).loadStep(pred, succ, prop)
-  }
-
-  override predicate loadStoreStep(DataFlow::Node pred, DataFlow::SourceNode succ, string prop) {
-    any(LegacyTypeTrackingStep s).loadStoreStep(pred, succ, prop)
-  }
-}