Removed code duplication

Author: Napalys

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

@@ -995,20 +995,6 @@ class ClassNode extends DataFlow::ValueNode, DataFlow::SourceNode {
       result = method.getBody().flow()
     )
     or
-    // ES6 class property or Function-style class methods via constructor
-    kind = MemberKind::method() and
-    exists(ThisNode receiver |
-      receiver = this.getConstructor().getReceiver() and
-      result = receiver.getAPropertySource()
-    )
-    or
-    // Function-style class methods via prototype
-    kind = MemberKind::method() and
-    exists(DataFlow::SourceNode proto |
-      proto = this.getAPrototypeReference() and
-      result = proto.getAPropertySource()
-    )
-    or
     // Function-style class accessors
     astNode instanceof Function and
     exists(PropertyAccessor accessor |

javascript/ql/test/library-tests/Classes/tests.expected

@@ -194,7 +194,6 @@ test_ConstructorDefinitions
 | tst.js:11:9:11:8 | constructor() {} |
 test_ClassNodeConstructor
 | dataflow.js:4:2:13:2 | class F ... \\n\\t\\t}\\n\\t} | dataflow.js:4:12:4:11 | () {} |
-| dataflow.js:4:12:4:11 | () {} | dataflow.js:4:12:4:11 | () {} |
 | fields.js:1:1:4:1 | class C ...  = 42\\n} | fields.js:1:9:1:8 | () {} |
 | points.js:1:1:18:1 | class P ... ;\\n  }\\n} | points.js:2:14:5:3 | (x, y)  ...  y;\\n  } |
 | points.js:20:1:33:1 | class C ... ;\\n  }\\n} | points.js:21:14:24:3 | (x, y,  ...  c;\\n  } |