Stop passing library elements to tons of namer functions.

sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart

 // Copyright (c) 2012, 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;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 244 matching lines @@
             js.use('Object').dot('prototype').dot(methodName).dot('call')
             .callWith(
                 <js.Expression>[js.use('this')]..addAll(
                     parameters.mappedBy((param) => js.use(param.name))))));
   }
 
   js.Block generateMethodBodyWithPrototypeCheckForElement(
       FunctionElement element,
       js.Block body,
       List<js.Parameter> parameters) {
-    String methodName;
-    Namer namer = backend.namer;
-    if (element.kind == ElementKind.FUNCTION) {
-      methodName = namer.instanceMethodName(element);
-    } else if (element.kind == ElementKind.GETTER) {
-      methodName = namer.getterName(element.getLibrary(), element.name);
-    } else if (element.kind == ElementKind.SETTER) {
-      methodName = namer.setterName(element.getLibrary(), element.name);
-    } else {
-      compiler.internalError("unexpected kind: '${element.kind}'",
-          element: element);
+    ElementKind kind = element.kind;
+    if (kind != ElementKind.FUNCTION &&
+        kind != ElementKind.GETTER &&
+        kind != ElementKind.SETTER) {
+      compiler.internalError("unexpected kind: '$kind'", element: element);
     }
 
+    String methodName = backend.namer.getName(element);
     return new js.Block(
         [generateMethodBodyWithPrototypeCheck(methodName, body, parameters)]);
   }
 
 
   void emitDynamicDispatchMetadata() {
     if (classesWithDynamicDispatch.isEmpty) return;
     int length = classesWithDynamicDispatch.length;
     if (!compiler.enableMinification) {
       nativeBuffer.add('// $length dynamic classes.\n');
@@ skipping 248 matching lines @@
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(js.prettyPrint(
           new js.ExpressionStatement(init), compiler));
       targetBuffer.add('\n');
     }
 
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }