Replace ${name} with $name where possible.

pkg/analyzer/lib/source/package_map_resolver.dart

Index: pkg/analyzer/lib/source/package_map_resolver.dart
diff --git a/pkg/analyzer/lib/source/package_map_resolver.dart b/pkg/analyzer/lib/source/package_map_resolver.dart
index 1f2f101986ae820d9e4cf33d2a85771c30e56946..de2c67374dac1e57541c76123ce459fc06f00970 100644
--- a/pkg/analyzer/lib/source/package_map_resolver.dart
+++ b/pkg/analyzer/lib/source/package_map_resolver.dart
@@ -82,7 +82,7 @@ class PackageMapUriResolver extends UriResolver {
         String pkgFolderPath = pkgFolder.path;
         if (sourcePath.startsWith(pkgFolderPath)) {
           String relPath = sourcePath.substring(pkgFolderPath.length);
-          return new Uri(path: '${PACKAGE_SCHEME}:$pkgName$relPath');
+          return new Uri(path: '$PACKAGE_SCHEME:$pkgName$relPath');
         }
       }
     }