XXX test gn format everything

content/public/plugin/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.
 
 # See //content/BUILD.gn for how this works.
 group("plugin") {
   if (is_component_build) {
-    public_deps = [ "//content" ]
+    public_deps = [
+      "//content",
+    ]
   } else {
-    public_deps = [ ":plugin_sources" ]
+    public_deps = [
+      ":plugin_sources",
+    ]
   }
 }
 
 source_set("plugin_sources") {
   visibility = [ "//content/*" ]
 
   sources = [
     "content_plugin_client.h",
   ]
 
   deps = [
     "//base",
     "//content/plugin",
     "//content/public/common:common_sources",
   ]
 }