Revert "Handle named mixin application in emitter"

pkg/compiler/lib/src/kernel/element_map_impl.dart

Index: pkg/compiler/lib/src/kernel/element_map_impl.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map_impl.dart b/pkg/compiler/lib/src/kernel/element_map_impl.dart
index ee77675d692c9439355f951c02c8075859ca9d7a..7a29d03b2f46b094cf3dfd842cd14270c79edbb6 100644
--- a/pkg/compiler/lib/src/kernel/element_map_impl.dart
+++ b/pkg/compiler/lib/src/kernel/element_map_impl.dart
@@ -524,7 +524,6 @@ class KernelToElementMapImpl extends KernelToElementMapMixin {
 
       if (node.supertype == null) {
         env.orderedTypeSet = new OrderedTypeSet.singleton(env.thisType);
-        env.isMixinApplication = false;
       } else {
         InterfaceType processSupertype(ir.Supertype node) {
           InterfaceType type = _typeConverter.visitSupertype(node);
@@ -538,11 +537,8 @@ class KernelToElementMapImpl extends KernelToElementMapMixin {
         LinkBuilder<InterfaceType> linkBuilder =
             new LinkBuilder<InterfaceType>();
         if (node.mixedInType != null) {
-          env.isMixinApplication = true;
           linkBuilder
               .addLast(env.mixedInType = processSupertype(node.mixedInType));
-        } else {
-          env.isMixinApplication = false;
         }
         node.implementedTypes.forEach((ir.Supertype supertype) {
           linkBuilder.addLast(processSupertype(supertype));
@@ -585,12 +581,6 @@ class KernelToElementMapImpl extends KernelToElementMapMixin {
     return env.supertype;
   }
 
-  bool _isMixinApplication(KClass cls) {
-    _KClassEnv env = _classEnvs[cls.classIndex];
-    _ensureSupertypes(cls, env);
-    return env.isMixinApplication;
-  }
-
   bool _isUnnamedMixinApplication(KClass cls) {
     _KClassEnv env = _classEnvs[cls.classIndex];
     _ensureSupertypes(cls, env);
@@ -881,7 +871,6 @@ class _KLibraryEnv {
 /// Environment for fast lookup of class members.
 class _KClassEnv {
   final ir.Class cls;
-  bool isMixinApplication;
   final bool isUnnamedMixinApplication;
 
   InterfaceType thisType;
@@ -1151,11 +1140,6 @@ class KernelElementEnvironment implements ElementEnvironment {
     return getThisType(cls).typeArguments.isNotEmpty;
   }
 
-  @override
-  bool isMixinApplication(KClass cls) {
-    return elementMap._isMixinApplication(cls);
-  }
-
   @override
   bool isUnnamedMixinApplication(KClass cls) {
     return elementMap._isUnnamedMixinApplication(cls);