Revert "Preliminary support for Windows manifests in the GN build."

build/win/BUILD.gn

Index: build/win/BUILD.gn
diff --git a/build/win/BUILD.gn b/build/win/BUILD.gn
deleted file mode 100644
index 466e7ee84bf8cc45697def84f00af5c05f437f0f..0000000000000000000000000000000000000000
--- a/build/win/BUILD.gn
+++ /dev/null
@@ -1,16 +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("//build/config/win/manifest.gni")
-
-# Depending on this target will cause the manifests for Chrome's default
-# Windows and common control compatibility and elevation for executables.
-windows_manifest("default_exe_manifest") {
-  sources = [
-    as_invoker_manifest,
-    common_controls_manifest,
-    default_compatibility_manifest,
-  ]
-  type = "exe"
-}