GN build improvements.

tools/gn/secondary/third_party/zlib/BUILD.gn

Index: tools/gn/secondary/third_party/zlib/BUILD.gn
diff --git a/tools/gn/secondary/third_party/zlib/BUILD.gn b/tools/gn/secondary/third_party/zlib/BUILD.gn
deleted file mode 100644
index 323ff86e9bb121dd4a71df71912f778dea2ce836..0000000000000000000000000000000000000000
--- a/tools/gn/secondary/third_party/zlib/BUILD.gn
+++ /dev/null
@@ -1,102 +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.
-
-config("zlib_config") {
-  include_dirs = [ "." ]
-}
-
-static_library("zlib") {
-  if (!is_win) {
-    # Don't stomp on "libzlib" on other platforms.
-    output_name = "chrome_zlib"
-  }
-
-  sources = [
-    "adler32.c",
-    "compress.c",
-    "crc32.c",
-    "crc32.h",
-    "deflate.c",
-    "deflate.h",
-    "gzclose.c",
-    "gzguts.h",
-    "gzlib.c",
-    "gzread.c",
-    "gzwrite.c",
-    "infback.c",
-    "inffast.c",
-    "inffast.h",
-    "inffixed.h",
-    "inflate.c",
-    "inflate.h",
-    "inftrees.c",
-    "inftrees.h",
-    "mozzconf.h",
-    "trees.c",
-    "trees.h",
-    "uncompr.c",
-    "zconf.h",
-    "zlib.h",
-    "zutil.c",
-    "zutil.h",
-  ]
-
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
-
-  direct_dependent_configs = [ ":zlib_config" ]
-}
-
-static_library("minizip") {
-  sources = [
-    "contrib/minizip/ioapi.c",
-    "contrib/minizip/ioapi.h",
-    "contrib/minizip/iowin32.c",
-    "contrib/minizip/iowin32.h",
-    "contrib/minizip/unzip.c",
-    "contrib/minizip/unzip.h",
-    "contrib/minizip/zip.c",
-    "contrib/minizip/zip.h",
-  ]
-
-  if (!is_win) {
-    sources -= [
-      "contrib/minizip/iowin32.c",
-      "contrib/minizip/iowin32.h",
-    ]
-  }
-  if (is_mac || is_ios || is_android) {
-    # Mac, Android and the BSDs don't have fopen64, ftello64, or fseeko64. We
-    # use fopen, ftell, and fseek instead on these systems.
-    defines = [ "USE_FILE32API" ]
-  }
-
-  if (is_clang) {
-    # zlib uses `if ((a == b))` for some reason.
-    cflags = [ "-Wno-parentheses-equality" ]
-  }
-
-  deps = [ ":zlib" ]
-
-  configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
-  direct_dependent_configs = [ ":zlib_config" ]
-}
-
-if (!is_android) {
-  static_library("zip") {
-    sources = [
-      "google/zip.cc",
-      "google/zip.h",
-      "google/zip_internal.cc",
-      "google/zip_internal.h",
-      "google/zip_reader.cc",
-      "google/zip_reader.h",
-    ]
-    deps = [
-      ":minizip",
-      "//base",
-    ]
-  }
-}