XXX test gn format everything

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.
 
 source_set("environment") {
   sources = [
     "async_waiter.h",
     "logging.h",
     "environment.h",
   ]
 
-  public_deps = [ "//mojo/public/c/environment" ]
+  public_deps = [
+    "//mojo/public/c/environment",
+  ]
 
   deps = [
     "//mojo/public/cpp/bindings:callback",
     "//mojo/public/cpp/system",
   ]
 }
 
 source_set("standalone") {
   sources = [
     "lib/async_waiter.cc",
     "lib/default_async_waiter.cc",
     "lib/default_async_waiter.h",
     "lib/default_logger.cc",
     "lib/default_logger.h",
     "lib/environment.cc",
     "lib/logging.cc",
   ]
 
-  public_deps = [ ":environment" ]
+  public_deps = [
+    ":environment",
+  ]
 
   deps = [
     "//mojo/public/c/environment",
     "//mojo/public/cpp/utility",
   ]
 }