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

chrome_elf/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("//chrome/version.gni")
 import("//testing/test.gni")
 
 process_version("chrome_elf_resources") {
   sources = [
     "chrome_elf.ver",
   ]
   output = "$target_gen_dir/chrome_elf_version.rc"
 }
 
 shared_library("chrome_elf") {
   sources = [
-    "$target_gen_dir/chrome_elf_version.rc",
     "chrome_elf_main.cc",
     "chrome_elf_main.h",
   ]
   deps = [
     ":blacklist",
     ":breakpad",
     ":lib",
     ":chrome_elf_resources",
   ]
   configs += [ "//build/config/win:windowed" ]
@@ skipping 166 matching lines @@
   ]
   ldflags = [ "/DEF:" + rebase_path("blacklist/test/blacklist_test_dll_2.def",
                                     root_build_dir) ]
 }
 
 shared_library("blacklist_test_dll_3") {
   sources = [
     "blacklist/test/blacklist_test_dll_3.cc",
   ]
 }