Update imports to use package:compiler and package:try.

dart/tests/compiler/dart2js/unparser2_test.dart

Index: dart/tests/compiler/dart2js/unparser2_test.dart
diff --git a/dart/tests/compiler/dart2js/unparser2_test.dart b/dart/tests/compiler/dart2js/unparser2_test.dart
index ced1c3192d4e10d40cad2944ab2c608960f38730..bbf3e3de93494c52b2e184e263081ca717cbff1f 100644
--- a/dart/tests/compiler/dart2js/unparser2_test.dart
+++ b/dart/tests/compiler/dart2js/unparser2_test.dart
@@ -3,18 +3,18 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
-import "../../../sdk/lib/_internal/compiler/implementation/scanner/scannerlib.dart";
-import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
+import "package:compiler/implementation/scanner/scannerlib.dart";
+import "package:compiler/implementation/tree/tree.dart";
 
-import "../../../sdk/lib/_internal/compiler/implementation/dart2jslib.dart"
+import "package:compiler/implementation/dart2jslib.dart"
     show DiagnosticListener,
          Script;
 
-import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart"
+import "package:compiler/implementation/elements/elements.dart"
     show CompilationUnitElement,
          LibraryElement;
 
-import "../../../sdk/lib/_internal/compiler/implementation/elements/modelx.dart"
+import "package:compiler/implementation/elements/modelx.dart"
     show CompilationUnitElementX,
          LibraryElementX;