Make Uri.isAbsolute and Uri.hasAuthority getters.

sdk/lib/_internal/compiler/implementation/apiimpl.dart

Index: sdk/lib/_internal/compiler/implementation/apiimpl.dart
diff --git a/sdk/lib/_internal/compiler/implementation/apiimpl.dart b/sdk/lib/_internal/compiler/implementation/apiimpl.dart
index 663e003bc4f596d883af15382894afef2e779fbd..c9759f3cfa7a411599bfcb5a313db29fa83f8234 100644
--- a/sdk/lib/_internal/compiler/implementation/apiimpl.dart
+++ b/sdk/lib/_internal/compiler/implementation/apiimpl.dart
@@ -134,7 +134,7 @@ class Compiler extends leg.Compiler {
    * Reads the script designated by [readableUri].
    */
   leg.Script readScript(Uri readableUri, [tree.Node node]) {
-    if (!readableUri.isAbsolute()) {
+    if (!readableUri.isAbsolute) {
       internalError('Relative uri $readableUri provided to readScript(Uri)',
                     node: node);
     }