Remove Compiler/JavaScriptBackend from metadata_collector

pkg/compiler/lib/src/js_backend/constant_emitter.dart

Index: pkg/compiler/lib/src/js_backend/constant_emitter.dart
diff --git a/pkg/compiler/lib/src/js_backend/constant_emitter.dart b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
index 0a47aac51bb5daa6d68f71c656613b8af4760ea4..f4a7110df7d55abc59785260c1865f8fc8dc4ccd 100644
--- a/pkg/compiler/lib/src/js_backend/constant_emitter.dart
+++ b/pkg/compiler/lib/src/js_backend/constant_emitter.dart
@@ -346,7 +346,8 @@ class ConstantEmitter implements ConstantValueVisitor<jsAst.Expression, Null> {
     List<jsAst.Expression> arguments = <jsAst.Expression>[];
     RuntimeTypesEncoder rtiEncoder = backend.rtiEncoder;
     for (ResolutionDartType argument in type.typeArguments) {
-      arguments.add(rtiEncoder.getTypeRepresentation(argument, unexpected));
+      arguments.add(rtiEncoder.getTypeRepresentation(
+          backend.emitter.emitter, argument, unexpected));
     }
     return new jsAst.ArrayInitializer(arguments);
   }