dart2js: patch file support cleanup

pkg/compiler/lib/src/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 dart2js.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
 import 'closure.dart' as closureMapping show ClosureTask;
@@ skipping 407 matching lines @@
             'importChain': importChains
                 .join(MessageTemplate.IMPORT_EXPERIMENTAL_MIRRORS_PADDING)
           });
         }
       }
     }
     backend.onLibrariesLoaded(loadedLibraries);
     return loadedLibraries;
   }
 
-  // TODO(johnniwinther): Move this to [PatchParser] when it is moved to the
-  // [JavaScriptBackend]. Currently needed for testing.
-  String get patchVersion => backend.patchVersion;
-
   /**
    * Get an [Uri] pointing to a patch for the dart: library with
    * the given path. Returns null if there is no patch.
    */
   Uri resolvePatchUri(String dartLibraryPath);
 
   Future runInternal(Uri uri) async {
     // TODO(ahe): This prevents memory leaks when invoking the compiler
     // multiple times. Implement a better mechanism where we can store
     // such caches in the compiler and get access to them through a
@@ skipping 1516 matching lines @@
   ResolutionFunctionType getLocalFunctionType(LocalFunctionElement function) {
     return function.type;
   }
 
   @override
   ResolutionDartType getUnaliasedType(ResolutionDartType type) {
     type.computeUnaliased(_resolution);
     return type.unaliased;
   }
 }