[PoC] Reformat all BUILD.gn and *.gni files with new gn.

mojo/public/platform/native/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.
 
 assert(!defined(is_nacl) || !is_nacl)
 
 source_set("system") {
   sources = [
     "system_thunks.cc",
     "system_thunks.h",
@@ skipping 21 matching lines @@
     "gles2_impl_thunks.h",
     "gles2_thunks.cc",
     "gles2_thunks.h",
   ]
 
   defines = [ "MOJO_GLES2_IMPLEMENTATION" ]
 
   configs += [ "//third_party/khronos:khronos_headers" ]
 
   deps = [
+    "//mojo/public/c/environment",
     "//mojo/public/c/gles2",
-    "//mojo/public/c/environment",
     "//mojo/public/c/system",
   ]
 
   if (is_mac) {
     # TODO(GYP): Make it a run-path dependent library.
     # 'DYLIB_INSTALL_NAME_BASE': '@loader_path',
   }
 }
 
 source_set("gpu_thunks") {
@@ skipping 14 matching lines @@
 source_set("mgl_onscreen_thunks") {
   sources = [
     "mgl_onscreen_thunks.c",
     "mgl_onscreen_thunks.h",
   ]
 
   deps = [
     "//mojo/public/c/gpu:MGL_onscreen",
   ]
 }