Revert "Simplify and fix implicit closure check, speed up Closure_equals"

runtime/observatory/lib/src/service/object.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of service;
 
 // Some value smaller than the object ring, so requesting a large array
 // doesn't result in an expired ref because the elements lapped it in the
 // object ring.
 const int kDefaultFieldLimit = 100;
@@ skipping 2989 matching lines @@
 
   ContextElement(Map map) : value = new Guarded<Instance>(map['value']);
 }
 
 M.FunctionKind stringToFunctionKind(String value) {
   switch (value) {
     case 'RegularFunction':
       return M.FunctionKind.regular;
     case 'ClosureFunction':
       return M.FunctionKind.closure;
-    case 'ImplicitClosureFunction':
-      return M.FunctionKind.implicitClosure;
     case 'GetterFunction':
       return M.FunctionKind.getter;
     case 'SetterFunction':
       return M.FunctionKind.setter;
     case 'Constructor':
       return M.FunctionKind.constructor;
     case 'ImplicitGetter':
       return M.FunctionKind.implicitGetter;
     case 'ImplicitSetter':
       return M.FunctionKind.implicitSetter;
@@ skipping 1677 matching lines @@
   final String alias;
   final String method;
   final String service;
 
   Service(this.alias, this.method, this.service) {
     assert(this.alias != null);
     assert(this.method != null);
     assert(this.service != null);
   }
 }