Forcibly clear worker ref counts on shutdown.

content/public/test/mock_render_process_host.h

Index: content/public/test/mock_render_process_host.h
diff --git a/content/public/test/mock_render_process_host.h b/content/public/test/mock_render_process_host.h
index d35adac7a1c6eac07ba349a03625e659ce8fbeb5..78018a51a8459231bb0b83494ae6031ab6091a1a 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -103,10 +103,14 @@ class MockRenderProcessHost : public RenderProcessHost {
                                          int cdm_id) const override;
 #endif
   bool IsProcessBackgrounded() const override;
+
   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.