Add IncrementWorkerRefCount() and DecrementWorkerRefCount() to RenderProcessHostImpl.

content/public/test/mock_render_process_host.cc

Index: content/public/test/mock_render_process_host.cc
diff --git a/content/public/test/mock_render_process_host.cc b/content/public/test/mock_render_process_host.cc
index a2b058ad890d794dcd426dacaaa28b883157d13f..482bd47eafc629dadce3d719ceecb109ca3da0da 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -267,6 +267,10 @@ void MockRenderProcessHost::SetWebRtcLogMessageCallback(
 void MockRenderProcessHost::ResumeDeferredNavigation(
     const GlobalRequestID& request_id) {}
 
+void MockRenderProcessHost::SetExternalClientStatus(
+    bool has_external_worker_client) {
+}
+
 bool MockRenderProcessHost::OnMessageReceived(const IPC::Message& msg) {
   IPC::Listener* listener = listeners_.Lookup(msg.routing_id());
   if (listener)