Add IPC interface for switching the audio output device for a given audio stream in the browser.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index d4da1d4bb6376591e332a546da3f5d35088470e9..42057ca27928aa3c19bb8f1d084b069e616d92cc 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -795,7 +795,8 @@ void RenderProcessHostImpl::CreateMessageFilters() {
       audio_manager,
       AudioMirroringManager::GetInstance(),
       media_internals,
-      media_stream_manager);
+      media_stream_manager,
+      browser_context->GetResourceContext()->GetMediaDeviceIDSalt());
   AddFilter(audio_renderer_host_.get());
   AddFilter(
       new MidiHost(GetID(), BrowserMainLoop::GetInstance()->midi_manager()));