Have the unload event execute in background on cross-site navigations

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index faa42ebe5e3b0949825289b3e1cd49221cdd4fd3..257e92d7a6aa454026eba436700c9804b6c00e51 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -29,6 +29,7 @@ class BrowserMessageFilter;
 class RenderProcessHostObserver;
 class RenderWidgetHost;
 class StoragePartition;
+struct GlobalRequestID;
 
 typedef base::Thread* (*RendererMainThreadFactoryFunction)(
     const std::string& id);
@@ -223,6 +224,10 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
       base::Callback<void(const std::string&)> callback) = 0;
 #endif
 
+  // Tells the ResourceDispatcherHost to resume a deferred navigation without
+  // transferring it to a new renderer process.
+  virtual void ResumeDeferredNavigation(const GlobalRequestID& request_id) = 0;
+
   // Static management functions -----------------------------------------------
 
   // Flag to run the renderer in process.  This is primarily