JS: Update API usage in ClassValidator

Author: asgerf

javascript/ql/lib/semmle/javascript/frameworks/ClassValidator.qll

@@ -3,9 +3,6 @@
  */
 
 import javascript
-private import semmle.javascript.internal.NameResolution
-private import semmle.javascript.internal.TypeResolution
-private import semmle.javascript.internal.UnderlyingTypes
 
 /**
  * Provides predicates for reasoning about sanitization via the `class-validator` library.
@@ -53,10 +50,7 @@ module ClassValidator {
 
   pragma[noinline]
   private ClassDefinition getClassReferencedByPropRead(DataFlow::PropRead read) {
-    exists(NameResolution::Node type |
-      TypeResolution::valueHasType(read.getBase().asExpr(), type) and
-      UnderlyingTypes::nodeHasUnderlyingClassType(type, result.flow())
-    )
+    result = read.getBase().asExpr().getTypeBinding().getAnUnderlyingClass().getAstNode()
   }
 
   /**