Un-nest configs in GN files.

sdch/BUILD.gn

 # Copyright 2014 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("sdch_config") {
   include_dirs = [ "open-vcdiff/src" ]
 }
 
+# gn orders flags on a target before flags from configs. The default config
+# adds -Wall, and these flags have to be after -Wall -- so they need to come
+# from a config and can't be on the target directly.
+config("sdch_warnings") {
+  cflags = []
+  if (is_linux) {
+    # TODO(mostynb): remove this if open-vcdiff is ever updated for c++11:
+    cflags += [ "-Wno-deprecated-declarations" ]
+  }
+}
+
 static_library("sdch") {
   sources = [
     "logging_forward.h",
     "open-vcdiff/src/addrcache.cc",
     "open-vcdiff/src/blockhash.cc",
     "open-vcdiff/src/blockhash.h",
     "open-vcdiff/src/checksum.h",
     "open-vcdiff/src/codetable.cc",
     "open-vcdiff/src/codetable.h",
     "open-vcdiff/src/compile_assert.h",
@@ skipping 16 matching lines @@
     "open-vcdiff/src/varint_bigendian.h",
     "open-vcdiff/src/vcdecoder.cc",
     "open-vcdiff/src/vcdiff_defs.h",
     "open-vcdiff/src/vcdiffengine.cc",
     "open-vcdiff/src/vcdiffengine.h",
     "open-vcdiff/src/vcencoder.cc",
     "open-vcdiff/vsprojects/config.h",
     "open-vcdiff/vsprojects/stdint.h",
   ]
 
+  configs += [ ":sdch_warnings" ]
   public_configs = [ ":sdch_config" ]
 
   deps = [
     "//base",
     "//third_party/zlib",
   ]
 
-  # gn orders flags on a target before flags from configs. The default config
-  # adds -Wall, and these flags have to be after -Wall -- so they need to come
-  # from a config and can't be on the target directly.
-  config("sdch_warnings") {
-    cflags = []
-    if (is_linux) {
-      # TODO(mostynb): remove this if open-vcdiff is ever updated for c++11:
-      cflags += [ "-Wno-deprecated-declarations" ]
-    }
-  }
-  configs += [ ":sdch_warnings" ]
-
   if (is_linux || is_android) {
     include_dirs = [ "linux" ]
   } else if (is_ios) {
     include_dirs = [ "ios" ]
   } else if (is_mac) {
     include_dirs = [ "mac" ]
     defines = [ "OPEN_VCDIFF_USE_AUTO_PTR" ]
   } else if (is_win) {
     include_dirs = [ "win" ]
   }
@@ skipping 11 matching lines @@
       "sdch/logging_forward.h",
     ]
   } else {
     logging_file = rebase_path("logging_forward.h", root_build_dir)
     cflags = [
       "-include",
       logging_file,
     ]
   }
 }