Move namer into javascript backend.

lib/compiler/implementation/js_backend/namer.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer {
   final Compiler compiler;
 
@@ skipping 43 matching lines @@
   // We sometimes handle continue targets differently from break targets,
   // so we have special continue-only labels.
   String continueLabelName(LabelElement label) {
     return 'c\$${label.labelName}\$${label.target.nestingLevel}';
   }
 
   String implicitContinueLabelName(TargetElement target) {
     return 'c\$${target.nestingLevel}';
   }
 
-  /** Returns a non-unique name for the given closure element. */
-  String closureName(Element element) {
-    List<String> parts = <String>[];
-    SourceString ownName = element.name;
-    if (ownName == null || ownName.stringValue == "") {
-      parts.add("anon");
-    } else {
-      parts.add(ownName.slowToString());
-    }
-    for (Element enclosingElement = element.enclosingElement;
-         enclosingElement != null &&
-             (enclosingElement.kind === ElementKind.GENERATIVE_CONSTRUCTOR_BODY
-              || enclosingElement.kind === ElementKind.CLASS
-              || enclosingElement.kind === ElementKind.FUNCTION
-              || enclosingElement.kind === ElementKind.GETTER
-              || enclosingElement.kind === ElementKind.SETTER);
-         enclosingElement = enclosingElement.enclosingElement) {
-      SourceString surroundingName = enclosingElement.name;
-      if (surroundingName != null) {
-        String surroundingNameString = surroundingName.slowToString();
-        if (surroundingNameString != "") parts.add(surroundingNameString);
-      }
-    }
-    // Invert the parts.
-    for (int i = 0, j = parts.length - 1; i < j; i++, j--) {
-      var tmp = parts[i];
-      parts[i] = parts[j];
-      parts[j] = tmp;
-    }
-    return safeName(Strings.join(parts, "_"));
-  }
-
   String privateName(LibraryElement lib, SourceString name) {
     if (name.isPrivate()) {
       String nameString = name.slowToString();
       // The first library asking for a short private name wins.
       LibraryElement owner =
           shortPrivateNameOwners.putIfAbsent(nameString, () => lib);
       // If a private name could clash with a mangled private name we don't
       // use the short name. For example a private name "_lib3_foo" would
       // clash with "_foo" from "lib3".
       if (owner === lib && !nameString.startsWith('_$LIBRARY_PREFIX')) {
@@ skipping 198 matching lines @@
   }
 
   String safeName(String name) {
     if (jsReserved.contains(name) || name.startsWith('\$')) {
       name = "\$$name";
       assert(!jsReserved.contains(name));
     }
     return name;
   }
 }