[FE] Convert ClassId.java to Kotlin

core/deserialization.common/src/org/jetbrains/kotlin/serialization/deserialization/MetadataUtil.kt

@@ -15,7 +15,7 @@ import java.io.InputStream
 
 class MetadataClassDataFinder(val finder: KotlinMetadataFinder) : ClassDataFinder {
     override fun findClassData(classId: ClassId): ClassData? {
-        val topLevelClassId = generateSequence(classId, ClassId::getOuterClassId).last()
+        val topLevelClassId = generateSequence(classId, ClassId::outerClassId).last()
         val stream = finder.findMetadata(topLevelClassId) ?: return null
         val (message, nameResolver, version) = readProto(stream)
         return message.class_List.firstOrNull { classProto ->
@@ -41,4 +41,4 @@ fun readProto(stream: InputStream): Triple<ProtoBuf.PackageFragment, NameResolve
     val message = ProtoBuf.PackageFragment.parseFrom(stream, BuiltInSerializerProtocol.extensionRegistry)
     val nameResolver = NameResolverImpl(message.strings, message.qualifiedNames)
     return Triple(message, nameResolver, version)
-}
+}