Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

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

Index: third_party/protobuf/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php
diff --git a/third_party/protobuf/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php b/third_party/protobuf/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php
deleted file mode 100644
index 62768b5ce07c5b31e8e57421d2dc694d36b005c0..0000000000000000000000000000000000000000
--- a/third_party/protobuf/php/src/Google/Protobuf/Internal/MethodOptions_IdempotencyLevel.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-# Generated by the protocol buffer compiler.  DO NOT EDIT!
-# source: google/protobuf/descriptor.proto
-
-/**
- * <pre>
- * Is this method side-effect-free (or safe in HTTP parlance), or idempotent,
- * or neither? HTTP based RPC implementation may choose GET verb for safe
- * methods, and PUT verb for idempotent methods instead of the default POST.
- * </pre>
- *
- * Protobuf enum <code>google.protobuf.MethodOptions.IdempotencyLevel</code>
- */
-namespace Google\Protobuf\Internal;
-
-class MethodOptions_IdempotencyLevel
-{
-    /**
-     * <code>IDEMPOTENCY_UNKNOWN = 0;</code>
-     */
-    const IDEMPOTENCY_UNKNOWN = 0;
-    /**
-     * <pre>
-     * implies idempotent
-     * </pre>
-     *
-     * <code>NO_SIDE_EFFECTS = 1;</code>
-     */
-    const NO_SIDE_EFFECTS = 1;
-    /**
-     * <pre>
-     * idempotent, but may have side effects
-     * </pre>
-     *
-     * <code>IDEMPOTENT = 2;</code>
-     */
-    const IDEMPOTENT = 2;
-}
-