Add IncrementWorkerRefCount() and DecrementWorkerRefCount() to RenderProcessHostImpl.

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 063cb8e11d43b74b351af3c1d30034de7be5e6a1..1126feba72a94bdb97066ce12f1e9c5ad772b123 100644
--- a/content/public/test/mock_render_process_host.h
+++ b/content/public/test/mock_render_process_host.h
@@ -83,6 +83,8 @@ class MockRenderProcessHost : public RenderProcessHost {
 #endif
   virtual void ResumeDeferredNavigation(const GlobalRequestID& request_id)
       OVERRIDE;
+  virtual void SetExternalClientStatus(
+      bool has_external_worker_client) OVERRIDE;
 
   // IPC::Sender via RenderProcessHost.
   virtual bool Send(IPC::Message* msg) OVERRIDE;