Make create_installer_archive.py operate silently by default.

chrome/installer/mini_installer/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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 import("//chrome/version.gni")
 import("//third_party/icu/config.gni")
 
@@ skipping 91 matching lines @@
     rebase_path(release_file, root_build_dir),
     "--resource_file_path",
     rebase_path(packed_files_rc_file, root_build_dir),
     "--target_arch=$current_cpu",
     "--distribution=_google_chrome",
 
     # Optional arguments to generate diff installer.
     #'--last_chrome_installer=C:/Temp/base',
     #'--setup_exe_format=DIFF',
     #'--diff_algorithm=COURGETTE',
+
+    # Optional argument for verbose archiving output.
+    #'--verbose',
   ]
 
   if (enable_hidpi) {
     args += [ "--enable_hidpi=1" ]
   }
   if (is_component_build) {
     args += [ "--component_build=1" ]
   } else {
     outputs += [ "$root_out_dir/chrome.packed.7z" ]
   }
@@ skipping 67 matching lines @@
   libs = [ "setupapi.lib" ]
 
   deps = [
     ":archive",
     ":lib",
     ":version",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
 }