PPAPI: Refactor renderer side of browser host creation

content/renderer/pepper/renderer_ppapi_host_impl.cc

Index: content/renderer/pepper/renderer_ppapi_host_impl.cc
diff --git a/content/renderer/pepper/renderer_ppapi_host_impl.cc b/content/renderer/pepper/renderer_ppapi_host_impl.cc
index b6e6e9e7e46d08d3789a082ddf88d87788a68da4..2bb266ed217900f0e8a5bf4b52d99eddc2eb47ac 100644
--- a/content/renderer/pepper/renderer_ppapi_host_impl.cc
+++ b/content/renderer/pepper/renderer_ppapi_host_impl.cc
@@ -241,19 +241,20 @@ void RendererPpapiHostImpl::SetToExternalPluginHost() {
   is_external_plugin_host_ = true;
 }
 
-void RendererPpapiHostImpl::CreateBrowserResourceHosts(
+int32_t RendererPpapiHostImpl::CreateBrowserResourceHosts(
     PP_Instance instance,
     const std::vector<IPC::Message>& nested_msgs,
-    const base::Callback<void(const std::vector<int>&)>& callback) const {
+    const ResourceHostCreationCallback& callback) const {
   RenderFrame* render_frame = GetRenderFrameForInstance(instance);
   PepperBrowserConnection* browser_connection =
       PepperBrowserConnection::Get(render_frame);
   if (!browser_connection) {
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(callback, std::vector<int>(nested_msgs.size(), 0)));
+    ppapi::proxy::CompletedBrowserResourceHosts empty;
+    base::MessageLoop::current()->PostTask(FROM_HERE,
+                                           base::Bind(callback, empty));
+    return -1;
   } else {
-    browser_connection->SendBrowserCreate(
+    return browser_connection->SendBrowserCreate(
         module_->GetPluginChildId(), instance, nested_msgs, callback);
   }
 }