Remove frog dependencies from lib/compiler.

frog/tests/leg/src/mock_compiler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library('mock_compiler');
 
-#import("../../../../lib/uri/uri.dart");
+#import("dart:uri");
 
 #import("../../../../lib/compiler/implementation/elements/elements.dart");
 #import("../../../../lib/compiler/implementation/leg.dart");
 #import("../../../../lib/compiler/implementation/tree/tree.dart");
 #import("../../../../lib/compiler/implementation/util/util.dart");
 #import("parser_helper.dart");
 
 class WarningMessage {
   Node node;
   Message message;
@@ skipping 169 matching lines @@
   importLibrary(library, compiler.coreLibrary, compiler);
   return library;
 }
 
 class StringScript extends Script {
   final String code;
   StringScript(this.code) : super(null, null);
   String get text() => code;
   String get name() => "mock script";
 }