Add a GN flag for the Windows multi-dll build.

chrome/common/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("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_common.gypi") ],
                           "scope",
                           [ "../chrome_common.gypi" ])
@@ skipping 259 matching lines @@
     "env_vars.h",
     "net/test_server_locations.cc",
     "net/test_server_locations.h",
     "pref_font_script_names-inl.h",
     "pref_font_webkit_names.h",
     "pref_names.cc",
     "pref_names.h",
     "widevine_cdm_constants.cc",
     "widevine_cdm_constants.h",
   ]
-  sources += get_target_outputs(":make_chrome_version")
 
   deps = [
     ":make_chrome_version",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//components/bookmarks/common",
     "//third_party/widevine/cdm:version_h",
   ]
 
   if (enable_nacl) {
@@ skipping 39 matching lines @@
     "mac/app_mode_chrome_locator.mm",
     "mac/app_mode_common.h",
     "mac/app_mode_common.mm",
   ]
 
   deps = [
     ":constants",
     "//base",
   ]
 }