Revert "Handle named mixin application in emitter"

pkg/compiler/lib/src/resolution/resolution_strategy.dart

Index: pkg/compiler/lib/src/resolution/resolution_strategy.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_strategy.dart b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
index 51468afa7309c5a6eb6971d59e39a730716dbbf9..c29092f2b3b938f5090efe9b0754c9090128d06e 100644
--- a/pkg/compiler/lib/src/resolution/resolution_strategy.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_strategy.dart
@@ -407,11 +407,6 @@ class _CompilerElementEnvironment implements ElementEnvironment {
     return getThisType(cls).typeArguments.isNotEmpty;
   }
 
-  @override
-  bool isMixinApplication(ClassElement cls) {
-    return cls.isMixinApplication;
-  }
-
   @override
   bool isUnnamedMixinApplication(ClassElement cls) {
     return cls.isUnnamedMixinApplication;