Apply gn format with 'sources' sorting to src/

third_party/mojo/src/mojo/public/cpp/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.
 
 import("../../mojo_sdk.gni")
 
 mojo_sdk_source_set("environment") {
   sources = [
     "async_waiter.h",
+    "environment.h",
     "logging.h",
-    "environment.h",
   ]
 
   mojo_sdk_public_deps = [ "mojo/public/c/environment" ]
 
   mojo_sdk_deps = [
     "mojo/public/cpp/bindings:callback",
     "mojo/public/cpp/system",
   ]
 }
 
@@ skipping 10 matching lines @@
 
   public_deps = [
     ":environment",
   ]
 
   mojo_sdk_deps = [
     "mojo/public/c/environment",
     "mojo/public/cpp/utility",
   ]
 }