Don't canonicalize dart-URIs.

dart/lib/compiler/implementation/apiimpl.dart

Index: dart/lib/compiler/implementation/apiimpl.dart
diff --git a/dart/lib/compiler/implementation/apiimpl.dart b/dart/lib/compiler/implementation/apiimpl.dart
index c1dbfcd0a4d97f40f2a0cded0f49abbc0b15389f..0801e23364a3f67939d6bf27d0c505c22e1e727a 100644
--- a/dart/lib/compiler/implementation/apiimpl.dart
+++ b/dart/lib/compiler/implementation/apiimpl.dart
@@ -43,6 +43,7 @@ class Compiler extends leg.Compiler {
   }
 
   leg.Script readScript(Uri uri, [tree.Node node]) {
+    if (uri.scheme == 'dart') uri = translateDartUri(uri, node);
     var translated = translateUri(uri, node);
     String text = "";
     try {
@@ -64,7 +65,6 @@ class Compiler extends leg.Compiler {
 
   Uri translateUri(Uri uri, tree.Node node) {
     switch (uri.scheme) {
-      case 'dart': return translateDartUri(uri, node);
       case 'package': return translatePackageUri(uri, node);
       default: return uri;
     }