Add more size_t -> int warning fixes for the win x64 GN 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 294 matching lines @@
 
   if (is_win || is_mac) {
     sources += [
       "media_galleries/picasa_test_util.cc",
       "media_galleries/picasa_test_util.h",
       "media_galleries/pmp_test_util.cc",
       "media_galleries/pmp_test_util.h",
     ]
   }
 
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
   if (enable_extensions) {
     sources += [
       "extensions/extension_test_util.cc",
       "extensions/extension_test_util.h",
     ]
   }
 }