[PoC] Reformat all BUILD.gn and *.gni files with new gn.

components/sync_sessions/BUILD.gn

 # Copyright 2015 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.
 
 # GYP version: components/sync_sessions.gypi:sync_sessions
 source_set("sync_sessions") {
   sources = [
     "favicon_cache.cc",
     "favicon_cache.h",
     "local_session_event_router.h",
@@ skipping 72 matching lines @@
     "session_data_type_controller_unittest.cc",
     "synced_session_tracker_unittest.cc",
   ]
 
   deps = [
     ":sync_sessions",
     ":test_support",
     "//base:prefs",
     "//base:prefs_test_support",
     "//base/test:test_support",
-    "//testing/gmock",
     "//components/bookmarks/browser",
     "//components/history/core/browser",
     "//components/sessions:test_support",
     "//components/sync_driver",
     "//components/sync_driver:test_support",
-    "//testing/gtest",
     "//sync",
     "//sync:test_support_sync_api",
+    "//testing/gmock",
+    "//testing/gtest",
     "//ui/base:base",
     "//url",
   ]
 }