third_party/protobuf: Update to HEAD (83d681ee2c)

third_party/protobuf/php/src/Google/Protobuf/Internal/FieldDescriptorProto_Label.php

+<?php
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/protobuf/descriptor.proto
+
+/**
+ * Protobuf enum <code>google.protobuf.FieldDescriptorProto.Label</code>
+ */
+namespace Google\Protobuf\Internal;
+
+class FieldDescriptorProto_Label
+{
+    /**
+     * <pre>
+     * 0 is reserved for errors
+     * </pre>
+     *
+     * <code>LABEL_OPTIONAL = 1;</code>
+     */
+    const LABEL_OPTIONAL = 1;
+    /**
+     * <code>LABEL_REQUIRED = 2;</code>
+     */
+    const LABEL_REQUIRED = 2;
+    /**
+     * <code>LABEL_REPEATED = 3;</code>
+     */
+    const LABEL_REPEATED = 3;
+}
+