XXX test gn format everything

components/signin/core/browser/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.
 
 static_library("browser") {
   sources = [
     "about_signin_internals.cc",
     "about_signin_internals.h",
     "account_reconcilor.cc",
     "account_reconcilor.h",
@@ skipping 43 matching lines @@
   ]
 
   if (is_android) {
     sources -= [
       "mutable_profile_oauth2_token_service.cc",
       "mutable_profile_oauth2_token_service.h",
     ]
   }
 
   if (is_chromeos) {
-    sources -= [
-      "signin_manager.cc",
-    ]
+    sources -= [ "signin_manager.cc" ]
   }
 
   if (is_win) {
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     cflags = [ "/wd4267" ]
   }
 }
 
 static_library("test_support") {
   testonly = true
   sources = [
     "fake_auth_status_provider.cc",
     "fake_auth_status_provider.h",
     "test_signin_client.cc",
     "test_signin_client.h",
   ]
 
   deps = [
     ":browser",
     "//testing/gtest",
   ]
 }