Give the main frame a RenderWidget.

chrome/browser/background/background_contents_service.cc

Index: chrome/browser/background/background_contents_service.cc
diff --git a/chrome/browser/background/background_contents_service.cc b/chrome/browser/background/background_contents_service.cc
index d93ec84309d9e76b6696253051959a74b8943011..d5b14d9899f012d277191c0c98e78fa41f05aa8f 100644
--- a/chrome/browser/background/background_contents_service.cc
+++ b/chrome/browser/background/background_contents_service.cc
@@ -640,30 +640,26 @@ void BackgroundContentsService::LoadBackgroundContents(
   DVLOG(1) << "Loading background content url: " << url;
 
   BackgroundContents* contents = CreateBackgroundContents(
-      SiteInstance::CreateForURL(profile, url),
-      MSG_ROUTING_NONE,
-      MSG_ROUTING_NONE,
-      profile,
-      frame_name,
-      application_id,
-      std::string(),
-      NULL);
+      SiteInstance::CreateForURL(profile, url), MSG_ROUTING_NONE,
+      MSG_ROUTING_NONE, MSG_ROUTING_NONE, profile, frame_name, application_id,
+      std::string(), NULL);
 
   contents->CreateRenderViewSoon(url);
 }
 
 BackgroundContents* BackgroundContentsService::CreateBackgroundContents(
     SiteInstance* site,
-    int routing_id,
-    int main_frame_route_id,
+    int32_t routing_id,
+    int32_t main_frame_route_id,
+    int32_t main_frame_widget_route_id,
     Profile* profile,
     const std::string& frame_name,
     const base::string16& application_id,
     const std::string& partition_id,
     content::SessionStorageNamespace* session_storage_namespace) {
   BackgroundContents* contents = new BackgroundContents(
-      site, routing_id, main_frame_route_id, this, partition_id,
-      session_storage_namespace);
+      site, routing_id, main_frame_route_id, main_frame_widget_route_id, this,
+      partition_id, session_storage_namespace);
 
   // Register the BackgroundContents internally, then send out a notification
   // to external listeners.