JS: Remove code duplication library

javascript/ql/src/Metrics/FLinesOfDuplicatedCode.ql

@@ -13,27 +13,8 @@
  *       non-attributable
  */
 
-import external.CodeDuplication
-
-/**
- * Holds if line `l` of file `f` should be excluded from duplicated code detection.
- *
- * Currently, only lines on which an import declaration occurs are excluded.
- */
-predicate whitelistedLineForDuplication(File f, int l) {
-  exists(ImportDeclaration i | i.getFile() = f and i.getLocation().getStartLine() = l)
-}
-
-/**
- * Holds if line `l` of file `f` belongs to a block of lines that is duplicated somewhere else.
- */
-predicate dupLine(int l, File f) {
-  exists(DuplicateBlock d | d.sourceFile() = f |
-    l in [d.sourceStartLine() .. d.sourceEndLine()] and
-    not whitelistedLineForDuplication(f, l)
-  )
-}
+import javascript
 
 from File f, int n
-where n = count(int l | dupLine(l, f))
+where none()
 select f, n order by n desc