Work on GN Win64 build.

content/ppapi_plugin/broker_process_dispatcher.cc

 // Copyright (c) 2012 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.
 
 #include "content/ppapi_plugin/broker_process_dispatcher.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 291 matching lines @@
   scoped_ptr<PP_Flash_BrowserOperations_SiteSetting[]> site_array(
       new PP_Flash_BrowserOperations_SiteSetting[sites.size()]);
 
   for (size_t i = 0; i < sites.size(); ++i) {
     site_array[i].site = sites[i].site.c_str();
     site_array[i].permission = sites[i].permission;
   }
 
   if (flash_browser_operations_1_3_) {
     PP_Bool result = flash_browser_operations_1_3_->SetSitePermission(
-        data_str.c_str(), setting_type, sites.size(), site_array.get());
+        data_str.c_str(), setting_type,
+        static_cast<uint32_t>(sites.size()), site_array.get());
 
     return PP_ToBool(result);
   }
 
   if (flash_browser_operations_1_2_) {
     PP_Bool result = flash_browser_operations_1_2_->SetSitePermission(
-        data_str.c_str(), setting_type, sites.size(), site_array.get());
+        data_str.c_str(), setting_type,
+        static_cast<uint32_t>(sites.size()), site_array.get());
 
     return PP_ToBool(result);
   }
 
   return false;
 }
 
 }  // namespace content