Remove the ability in dart2js to turn off syntax-only generic methods.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index c7bdcdf6191a3a88555adec831f84472a405456d..7b4d9cebc468df074be5285f5780ea0288ed1086 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -257,7 +257,7 @@ abstract class Compiler implements LibraryLoaderListener {
 
     tasks = [
       dietParser =
-          new DietParserTask(options, idGenerator, backend, reporter, measurer),
+          new DietParserTask(idGenerator, backend, reporter, measurer),
       scanner = createScannerTask(),
       serialization = new SerializationTask(this),
       libraryLoader = new LibraryLoaderTask(
@@ -271,8 +271,8 @@ abstract class Compiler implements LibraryLoaderListener {
           environment,
           reporter,
           measurer),
-      parser = new ParserTask(this, options),
-      patchParser = new PatchParserTask(this, options),
+      parser = new ParserTask(this),
+      patchParser = new PatchParserTask(this),
       resolver = createResolverTask(),
       closureToClassMapper = new closureMapping.ClosureTask(this),
       checker = new TypeCheckerTask(this),
@@ -291,7 +291,7 @@ abstract class Compiler implements LibraryLoaderListener {
     }
 
     _parsingContext =
-        new ParsingContext(reporter, options, parser, patchParser, backend);
+        new ParsingContext(reporter, parser, patchParser, backend);
 
     tasks.addAll(backend.tasks);
   }