Use library name instead of filename.

dart/site/try/poi/poi.dart

Index: dart/site/try/poi/poi.dart
diff --git a/dart/site/try/poi/poi.dart b/dart/site/try/poi/poi.dart
index d9cdeba2fb3cc6592129f0078894a5af7a97c1f0..e1755c04edc8e4fc84d2e32b87c2c672d5385a7e 100644
--- a/dart/site/try/poi/poi.dart
+++ b/dart/site/try/poi/poi.dart
@@ -55,9 +55,6 @@ import 'package:compiler/implementation/scanner/scannerlib.dart' show
     PartialElement,
     Token;
 
-import 'package:compiler/implementation/util/uri_extras.dart' show
-    relativize;
-
 /// Controls if this program should be querying Dart Mind. Used by tests.
 bool enableDartMind = true;
 
@@ -335,7 +332,7 @@ class ScopeInformationVisitor extends ElementVisitor/* <void> */ {
     bool isFirst = true;
     serialize(
         e, omitEnclosing: true,
-        name: relativize(Uri.base, e.canonicalUri, false),
+        name: e.getLibraryName(),
         serializeMembers: () {
           // TODO(ahe): Include imported elements in libraries.
           e.forEachLocalMember((Element member) {