GN build improvements.

tools/gn/secondary/third_party/mach_override/BUILD.gn

Index: tools/gn/secondary/third_party/mach_override/BUILD.gn
diff --git a/tools/gn/secondary/third_party/mach_override/BUILD.gn b/tools/gn/secondary/third_party/mach_override/BUILD.gn
deleted file mode 100644
index f50d3cc6c1343a738161e05db54896e84341ab12..0000000000000000000000000000000000000000
--- a/tools/gn/secondary/third_party/mach_override/BUILD.gn
+++ /dev/null
@@ -1,37 +0,0 @@
-# Copyright (c) 2013 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.
-
-static_library("libudis86") {
-  sources = [
-    "libudis86/decode.c",
-    "libudis86/decode.h",
-    "libudis86/extern.h",
-    "libudis86/input.c",
-    "libudis86/input.h",
-    "libudis86/itab.c",
-    "libudis86/itab.h",
-    "libudis86/syn-att.c",
-    "libudis86/syn-intel.c",
-    "libudis86/syn.c",
-    "libudis86/syn.h",
-    "libudis86/types.h",
-    "libudis86/udint.h",
-    "libudis86/udis86.c",
-    "udis86.h",
-  ]
-  defines = [
-    "HAVE_ASSERT_H",
-    "HAVE_STRING_H",
-  ]
-}
-
-static_library("mach_override") {
-  sources = [
-    "mach_override.c",
-    "mach_override.h",
-  ]
-  deps = [
-    ":libudis86",
-  ]
-}