XXX test gn format everything

ui/snapshot/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("//build/config/ui.gni")
 
 component("snapshot") {
   sources = [
     "snapshot.h",
     "snapshot_android.cc",
@@ skipping 26 matching lines @@
       "snapshot_async.h",
     ]
   }
 
   if (use_aura) {
     deps += [
       "//ui/aura",
       "//ui/compositor",
     ]
   } else {
-    sources -= [
-      "snapshot_aura.cc"
-    ]
+    sources -= [ "snapshot_aura.cc" ]
   }
 }
 
 test("snapshot_unittests") {
   sources = [
     "snapshot_aura_unittest.cc",
     "snapshot_mac_unittest.mm",
     "test/run_all_unittests.cc",
   ]
 
@@ skipping 14 matching lines @@
     deps += [
       "//ui/aura:test_support",
       "//ui/compositor",
       "//ui/compositor:test_support",
       "//ui/wm",
     ]
   } else {
     sources -= [ "snapshot_aura_unittest.cc" ]
   }
 }