Change spanFromNode to spanFromSpannable.

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

Index: sdk/lib/_internal/compiler/implementation/library_loader.dart
diff --git a/sdk/lib/_internal/compiler/implementation/library_loader.dart b/sdk/lib/_internal/compiler/implementation/library_loader.dart
index 3bc867dd2e83106afcf01d7e2b4dc610dfbeda3d..d7b538e6acba61e10ae1732c6fe69eb7db276732 100644
--- a/sdk/lib/_internal/compiler/implementation/library_loader.dart
+++ b/sdk/lib/_internal/compiler/implementation/library_loader.dart
@@ -225,12 +225,12 @@ class LibraryLoaderTask extends LibraryLoader {
       if (!identical(existing, library)) {
         Uri uri = library.entryCompilationUnit.script.uri;
         compiler.reportMessage(
-            compiler.spanFromNode(tag.name, uri),
+            compiler.spanFromSpannable(tag.name, uri),
             MessageKind.DUPLICATED_LIBRARY_NAME.error([name]),
             api.Diagnostic.WARNING);
         Uri existingUri = existing.entryCompilationUnit.script.uri;
         compiler.reportMessage(
-            compiler.spanFromNode(existing.libraryTag.name, existingUri),
+            compiler.spanFromSpannable(existing.libraryTag.name, existingUri),
             MessageKind.DUPLICATED_LIBRARY_NAME.error([name]),
             api.Diagnostic.WARNING);
       }