SDK mocking for improved test throughput.

lib/src/linter.dart

Index: lib/src/linter.dart
diff --git a/lib/src/linter.dart b/lib/src/linter.dart
index fd4cc1b4df415415fbf7188b7236f90fb4a932b1..68b40f767840fd2afbb570b4ce8d4fcb2f354b0b 100644
--- a/lib/src/linter.dart
+++ b/lib/src/linter.dart
@@ -61,9 +61,6 @@ class DartLinter implements AnalysisErrorListener {
   /// Creates a new linter.
   DartLinter(this.options, {this.reporter: const PrintingReporter()});
 
-  factory DartLinter.forRules(Iterable<LintRule> ruleSet) =>
-      new DartLinter(new LinterOptions(ruleSet));
-
   Iterable<AnalysisErrorInfo> lintFiles(List<File> files) {
     List<AnalysisErrorInfo> errors = [];
     var analysisDriver = new AnalysisDriver(options);