Refactored code to allow associating workers with multiple renderers.

chrome/browser/renderer_host/resource_dispatcher_host.cc

Index: chrome/browser/renderer_host/resource_dispatcher_host.cc
diff --git a/chrome/browser/renderer_host/resource_dispatcher_host.cc b/chrome/browser/renderer_host/resource_dispatcher_host.cc
index 65182c275b5d353b777b3ba1f867340bab8583a1..2907d7fd26571488ee33a9146b4e4df0afd34d00 100644
--- a/chrome/browser/renderer_host/resource_dispatcher_host.cc
+++ b/chrome/browser/renderer_host/resource_dispatcher_host.cc
@@ -159,7 +159,11 @@ class RVHDelegateNotificationTask : public Task {
     if (!ResourceDispatcherHost::RenderViewForRequest(request,
                                                       &render_process_host_id_,
                                                       &render_view_host_id_)) {
-      NOTREACHED();
+      // Issue a warning here - this can happen during normal operation (for
+      // example, if a worker exits while a network operation is pending), but
+      // it should be fairly rare.
+      DLOG(WARNING) << "Trying to deliver a message to a RenderViewHost" <<
+                       " that has already exited or has never existed.";
     }
   }
 
@@ -1451,8 +1455,13 @@ bool ResourceDispatcherHost::RenderViewForRequest(const URLRequest* request,
         *render_view_host_id = -1;
         return false;
       }
-      *render_process_host_id = worker_instance->renderer_id();
-      *render_view_host_id = worker_instance->render_view_route_id();
+      DCHECK(!worker_instance->worker_document_set()->IsEmpty());
+      const WorkerDocumentSet::DocumentInfoSet& parents =
+          worker_instance->worker_document_set()->documents();
+      // Need to display some related UI for this network request - pick an
+      // arbitrary parent to do so.
+      *render_process_host_id = parents.begin()->renderer_id();
+      *render_view_host_id = parents.begin()->render_view_route_id();
   } else {
     *render_process_host_id = info->child_id();
     *render_view_host_id = info->route_id();