Remove emission of generic type checks.

sdk/lib/_internal/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.
 
 part of js_backend;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 933 matching lines @@
     return name;
   }
 
   String substitutionName(Element element) {
     // TODO(ahe): Creating a string here is unfortunate. It is slow (due to
     // string concatenation in the implementation), and may prevent
     // segmentation of '$'.
     return '${operatorAsPrefix()}${getNameForRti(element)}';
   }
 
-  String signatureLocation(FunctionType type) {
-    ClassElement classElement = Types.getClassContext(type);
-    return (classElement != null)
-        ? '${isolateAccess(classElement)}'
-        : currentIsolate;
-  }
-
-  String signatureName(FunctionType type) {
-    String signature = '${operatorSignature()}_${getFunctionTypeName(type)}';
-    return '${signatureLocation(type)}.$signature';
-  }
-
   String safeName(String name) => _safeName(name, jsReserved);
   String safeVariableName(String name) => _safeName(name, jsVariableReserved);
 
   String operatorNameToIdentifier(String name) {
     if (name == null) return null;
     if (name == '==') {
       return r'$eq';
     } else if (name == '~') {
       return r'$not';
     } else if (name == '[]') {
@@ skipping 415 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(link.head);
         first = true;
       }
     }
   }
 }