Revert of Add remoting and PPAPI tests to GN build

remoting/host/native_messaging/BUILD.gn

Index: remoting/host/native_messaging/BUILD.gn
diff --git a/remoting/host/native_messaging/BUILD.gn b/remoting/host/native_messaging/BUILD.gn
deleted file mode 100644
index afefee11de6661543735a9f18de4e3c96c0ae163..0000000000000000000000000000000000000000
--- a/remoting/host/native_messaging/BUILD.gn
+++ /dev/null
@@ -1,19 +0,0 @@
-# Copyright 2015 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("//remoting/remoting_srcs.gni")
-
-# GYP version: remoting/remoting_host.gypi:remoting_native_messaging_base
-source_set("native_messaging") {
-  sources = rebase_path(
-          remoting_host_srcs_gypi_values.remoting_host_native_messaging_sources,
-          ".",
-          "//remoting")
-
-  configs += [ "//build/config/compiler:wexit_time_destructors" ]
-
-  deps = [
-    "//base",
-  ]
-}