PPAPI: Refactor renderer side of browser host creation

chrome/renderer/pepper/pepper_flash_drm_renderer_host.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 "chrome/renderer/pepper/pepper_flash_drm_renderer_host.h"
 
 #include "base/files/file_path.h"
 #include "content/public/renderer/pepper_plugin_instance.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 55 matching lines @@
                  context->MakeReplyMessageContext(),
                  voucher_file,
                  renderer_pending_host_id));
   return PP_OK_COMPLETIONPENDING;
 }
 
 void PepperFlashDRMRendererHost::DidCreateFileRefHosts(
     const ppapi::host::ReplyMessageContext& reply_context,
     const base::FilePath& external_path,
     int renderer_pending_host_id,
-    const std::vector<int>& browser_pending_host_ids) {
-  DCHECK_EQ(1U, browser_pending_host_ids.size());
-  int browser_pending_host_id = browser_pending_host_ids[0];
+    const ppapi::proxy::CompletedBrowserResourceHosts& browser_hosts) {
+  if (browser_hosts.host_ids.empty()) {
+    NOTREACHED();
+    return;
+  }
+  int browser_pending_host_id = browser_hosts.host_ids[0];
 
   ppapi::FileRefCreateInfo create_info =
       ppapi::MakeExternalFileRefCreateInfo(external_path,
                                            std::string(),
                                            browser_pending_host_id,
                                            renderer_pending_host_id);
   host()->SendReply(reply_context,
                     PpapiPluginMsg_FlashDRM_GetVoucherFileReply(create_info));
 }