Apply gn format with 'sources' sorting to src/

mojo/environment/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.
 
 # GYP version: mojo_base.gyp:mojo_environment_chromium
 source_set("chromium") {
   output_name = "mojo_environment_chromium"
 
   sources = [
     "environment.cc",
 
     # TODO(vtl): This is kind of ugly. (See TODO in logging.h.)
     "//third_party/mojo/src/mojo/public/cpp/environment/async_waiter.h",
     "//third_party/mojo/src/mojo/public/cpp/environment/lib/async_waiter.cc",
+    "//third_party/mojo/src/mojo/public/cpp/environment/lib/logging.cc",
     "//third_party/mojo/src/mojo/public/cpp/environment/logging.h",
-    "//third_party/mojo/src/mojo/public/cpp/environment/lib/logging.cc",
   ]
 
   public_deps = [
     ":chromium_impl",
   ]
 
   deps = [
     "//third_party/mojo/src/mojo/public/c/environment",
     "//third_party/mojo/src/mojo/public/cpp/bindings:callback",
     "//third_party/mojo/src/mojo/public/cpp/environment",
@@ skipping 20 matching lines @@
   public_configs =
       [ "//third_party/mojo/src/mojo/public/build/config:mojo_sdk" ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/common",
     "//third_party/mojo/src/mojo/public/c/environment",
   ]
 }