Revert of Upstream Chrome on iOS source code [11/11].

ios/chrome/browser/ui/contextual_search/protos/BUILD.gn

Index: ios/chrome/browser/ui/contextual_search/protos/BUILD.gn
diff --git a/ios/chrome/browser/ui/contextual_search/protos/BUILD.gn b/ios/chrome/browser/ui/contextual_search/protos/BUILD.gn
deleted file mode 100644
index a882a0608b1c2cba698dd80dd238a74e733a797e..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/contextual_search/protos/BUILD.gn
+++ /dev/null
@@ -1,11 +0,0 @@
-# Copyright 2016 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("//third_party/protobuf/proto_library.gni")
-
-proto_library("protos") {
-  sources = [
-    "client_discourse_context.proto",
-  ]
-}