[runtime] Remove specific Descriptor subclasses and add respective factory methods instead.

test/cctest/heap/test-alloc.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 136 matching lines @@
       Builtins::kEmptyFunction));
   // Patch the map to have an accessor for "get".
   Handle<Map> map(function->initial_map());
   Handle<DescriptorArray> instance_descriptors(map->instance_descriptors());
   CHECK(instance_descriptors->IsEmpty());
 
   PropertyAttributes attrs = NONE;
   Handle<AccessorInfo> foreign = TestAccessorInfo(isolate, attrs);
   Map::EnsureDescriptorSlack(map, 1);
 
-  AccessorConstantDescriptor d(Handle<Name>(Name::cast(foreign->name())),
-                               foreign, attrs);
+  Descriptor d = Descriptor::AccessorConstant(
+      Handle<Name>(Name::cast(foreign->name())), foreign, attrs);
   map->AppendDescriptor(&d);
 
   // Add the Foo constructor the global object.
   CHECK(env->Global()
             ->Set(env, v8::String::NewFromUtf8(CcTest::isolate(), "Foo",
                                                v8::NewStringType::kNormal)
                            .ToLocalChecked(),
                   v8::Utils::CallableToLocal(function))
             .FromJust());
   // Call the accessor through JavaScript.
@@ skipping 72 matching lines @@
       code_range.FreeRawMemory(blocks[index].base, blocks[index].size);
       current_allocated -= blocks[index].size;
       if (index < blocks.length() - 1) {
         blocks[index] = blocks.RemoveLast();
       } else {
         blocks.RemoveLast();
       }
     }
   }
 }