Refactored code to allow associating workers with multiple renderers.

chrome/renderer/webworker_base.h

Index: chrome/renderer/webworker_base.h
diff --git a/chrome/renderer/webworker_base.h b/chrome/renderer/webworker_base.h
index fe5beccafd194368349aca34be9c266c15ebe46d..6c031c89fb22d35b66ab359985923572454b5b82 100644
--- a/chrome/renderer/webworker_base.h
+++ b/chrome/renderer/webworker_base.h
@@ -20,6 +20,7 @@ class GURL;
 class WebWorkerBase : public IPC::Channel::Listener {
  public:
   WebWorkerBase(ChildThread* child_thread,
+                unsigned long long document_id,
                 int route_id,
                 int render_view_route_id);
 
@@ -61,6 +62,10 @@ class WebWorkerBase : public IPC::Channel::Listener {
   ChildThread* child_thread_;
 
  private:
+  // ID of our parent document (used to shutdown workers when the parent
+  // document is detached).
+  unsigned long long document_id_;
+
   // Stores messages that were sent before the StartWorkerContext message.
   std::vector<IPC::Message*> queued_messages_;
 };