Forcibly clear worker ref counts on shutdown.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 60994e910cacea09268c7dce2b51c1766db0d770..1fe59878c7f54577b8085c1f5e4c76a946de49b4 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -173,10 +173,14 @@ class CONTENT_EXPORT RenderProcessHostImpl
                                          int cdm_id) const override;
 #endif
   bool IsProcessBackgrounded() const override;
+

[jam, 2016/09/14 17:10:49]

nit: undo this blank line (we don't add empty lines between overridden methods)

[falken, 2016/09/21 08:59:43]

Who knew! Done.

   void IncrementServiceWorkerRefCount() override;
   void DecrementServiceWorkerRefCount() override;
   void IncrementSharedWorkerRefCount() override;
   void DecrementSharedWorkerRefCount() override;
+  void ForceReleaseWorkerRefCounts() override;
+  bool IsWorkerRefCountDisabled() override;
+
   void PurgeAndSuspend() override;
 
   // IPC::Sender via RenderProcessHost.
@@ -426,6 +430,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   size_t service_worker_ref_count_;
   size_t shared_worker_ref_count_;
 
+  // Set in ForceReleaseWorkerRefCounts. When true, worker ref counts must no
+  // longer be modified.
+  bool is_worker_ref_count_disabled_;
+
   // The registered IPC listener objects. When this list is empty, we should
   // delete ourselves.
   IDMap<IPC::Listener> listeners_;