Update repo to use dart2js from pkg/compiler.

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index dbc508764e2217bf8dde3c277739ad63aac13a6e..bfc02f311adc75559e03c0fbc631cf287c64689d 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -9,25 +9,25 @@ import 'dart:async';
 import 'dart:collection';
 
 import 'package:compiler/compiler.dart' as api;
-import 'package:compiler/implementation/elements/elements.dart';
-import 'package:compiler/implementation/js_backend/js_backend.dart'
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/js_backend/js_backend.dart'
     show JavaScriptBackend;
-import 'package:compiler/implementation/resolution/resolution.dart';
-import 'package:compiler/implementation/source_file.dart';
-import 'package:compiler/implementation/tree/tree.dart';
-import 'package:compiler/implementation/util/util.dart';
+import 'package:compiler/src/resolution/resolution.dart';
+import 'package:compiler/src/source_file.dart';
+import 'package:compiler/src/tree/tree.dart';
+import 'package:compiler/src/util/util.dart';
 import 'parser_helper.dart';
 
-import 'package:compiler/implementation/elements/modelx.dart'
+import 'package:compiler/src/elements/modelx.dart'
     show ElementX,
          LibraryElementX,
          ErroneousElementX,
          FunctionElementX;
 
-import 'package:compiler/implementation/dart2jslib.dart'
+import 'package:compiler/src/dart2jslib.dart'
     hide TreeElementMapping;
 
-import 'package:compiler/implementation/deferred_load.dart'
+import 'package:compiler/src/deferred_load.dart'
     show DeferredLoadTask,
          OutputUnit;