Default components to static libraries in GN build

build/config/chrome_build.gni

 # 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.
 
 declare_args() {
-  # Selects the desired build flavor. Official builds get additional
-  # processing to prepare for release. Normally you will want to develop and
-  # test with this flag off.
-  is_official_build = false
-
   # Select the desired branding flavor. False means normal Chromium branding,
   # true means official Google Chrome branding (requires extra Google-internal
   # resources).
   is_chrome_branded = false
 
   # Break chrome.dll into multple pieces based on process type. Only available
   # on Windows.
   is_multi_dll_chrome = is_win && !is_component_build
 }
 
 # Refers to the subdirectory for branding in various places including
 # chrome/app/theme.
 if (is_chrome_branded) {
   branding_path_component = "google_chrome"
 } else {
   branding_path_component = "chromium"
 }