Switch stream creation and closing in Chrome audio rendering from IPC to Mojo

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 43b47a342ffb39f632e07b907dad43de30a182f3..6cb68873de6710fb7b5bfbc19ecda42f22e74769 100644
--- a/content/public/test/mock_render_process_host.cc
+++ b/content/public/test/mock_render_process_host.cc
@@ -13,6 +13,7 @@
 #include "base/process/process_handle.h"
 #include "base/time/time.h"
 #include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/renderer_host/media/audio_renderer_host.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
@@ -343,6 +344,11 @@ bool MockRenderProcessHost::OnMessageReceived(const IPC::Message& msg) {
 
 void MockRenderProcessHost::OnChannelConnected(int32_t peer_pid) {}
 
+scoped_refptr<AudioRendererHost> MockRenderProcessHost::audio_renderer_host()
+    const {
+  return scoped_refptr<AudioRendererHost>(nullptr);
+};
+
 MockRenderProcessHostFactory::MockRenderProcessHostFactory() {}
 
 MockRenderProcessHostFactory::~MockRenderProcessHostFactory() {