dart2js: patch file support cleanup

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 f38f38956a7dfc4260ab44a424a16c28234657a0..5c53c74b4e6ab09477e6b832b192bc8f0085ff95 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -62,7 +62,6 @@ class MockCompiler extends Compiler {
   final int expectedErrors;
   final Map<String, SourceFile> sourceFiles;
   Node parsedTree;
-  final String testedPatchVersion;
   final LibrarySourceProvider librariesOverride;
   final DiagnosticCollector diagnosticCollector = new DiagnosticCollector();
   final ResolvedUriTranslator resolvedUriTranslator =
@@ -87,10 +86,8 @@ class MockCompiler extends Compiler {
       int this.expectedWarnings,
       int this.expectedErrors,
       api.CompilerOutput outputProvider,
-      String patchVersion,
       LibrarySourceProvider this.librariesOverride})
       : sourceFiles = new Map<String, SourceFile>(),
-        testedPatchVersion = patchVersion,
         super(
             options: new CompilerOptions(
                 entryPoint: new Uri(scheme: 'mock'),
@@ -135,10 +132,6 @@ class MockCompiler extends Compiler {
         buildLibrarySource(DEFAULT_LOOKUP_MAP_LIBRARY));
   }
 
-  String get patchVersion {
-    return testedPatchVersion != null ? testedPatchVersion : super.patchVersion;
-  }
-
   /// Initialize the mock compiler with an empty main library.
   Future<Uri> init([String mainSource = ""]) {
     Uri uri = new Uri(scheme: "mock");