dart2js: remove references to compiler in ResolvedUriTranslator

tests/compiler/dart2js/library_resolution_test.dart

 // Copyright (c) 2014, 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.
 
 /// Check that relative URIs are resolved against the canonical name of a
 /// library. This only matters for dart:-libraries, so this test mocks up two
 /// dart:-libraries.
 
 import "dart:io";
 
@@ skipping 19 matching lines @@
 Uri sdkRoot = Uri.base.resolve("sdk/");
 Uri mock1LibraryUri = sdkRoot.resolve("lib/mock1.dart");
 Uri mock2LibraryUri = sdkRoot.resolve("lib/mock2.dart");
 
 class CustomCompiler extends CompilerImpl {
   CustomCompiler(provider, handler, libraryRoot, packageRoot)
       : super(provider, const NullCompilerOutput(), handler,
             new CompilerOptions(
                 libraryRoot: libraryRoot,
                 packageRoot: packageRoot));
-
-  Uri lookupLibraryUri(String libraryName) {
-    if (libraryName == "m_o_c_k_1") return mock1LibraryUri;
-    if (libraryName == "m_o_c_k_2") return mock2LibraryUri;
-    return super.lookupLibraryUri(libraryName);
-  }
 }
 
 main() async {
   Uri packageRoot = Uri.base.resolve(Platform.packageRoot);
 
   var provider = new MemorySourceFileProvider(MEMORY_SOURCE_FILES);
   var handler = new FormattingDiagnosticHandler(provider);
 
   Future wrappedProvider(Uri uri) {
     if (uri == mock1LibraryUri) {
@@ skipping 24 matching lines @@
   }
 
   CompilerImpl compiler = new CustomCompiler(
       new LegacyCompilerInput(wrappedProvider),
       new LegacyCompilerDiagnostics(wrappedHandler),
       sdkRoot,
       packageRoot);
 
   asyncStart();
   await compiler.setupSdk();
+  // TODO(het): Find cleaner way to do this
+  compiler.resolvedUriTranslator.sdkLibraries['m_o_c_k_1'] = mock1LibraryUri;
+  compiler.resolvedUriTranslator.sdkLibraries['m_o_c_k_2'] = mock2LibraryUri;
   var library =
       await compiler.libraryLoader.loadLibrary(Uri.parse("dart:m_o_c_k_1"));
   await checkLibrary(library);
   asyncSuccess(null);
 }
 
 const Map MEMORY_SOURCE_FILES = const {
   "mock1.dart": "library mock1; import 'mock2.dart';",
   "mock2.dart": "library mock2;",
 };