Introduce AudioIPCFactory.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index a6ebbfb0c343a12bc3ba105dfb671119b23b8f48..f60da8d622a29544f08964b3191f0b4ae8bfa465 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -117,6 +117,7 @@
 #include "content/renderer/internal_document_state_data.h"
 #include "content/renderer/manifest/manifest_manager.h"
 #include "content/renderer/media/audio_device_factory.h"
+#include "content/renderer/media/audio_ipc_factory.h"
 #include "content/renderer/media/media_devices_listener_impl.h"
 #include "content/renderer/media/media_permission_dispatcher.h"
 #include "content/renderer/media/media_stream_dispatcher.h"
@@ -1222,6 +1223,9 @@ RenderFrameImpl::~RenderFrameImpl() {
   if (input_handler_manager)
     input_handler_manager->UnregisterRoutingID(GetRoutingID());
 
+  if (AudioIPCFactory::get())

[DaleCurtis, 2017/05/31 20:48:09]

If you like, you can write this as:

if (auto* factory = get())
  factory->...()

[Max Morin, 2017/06/01 13:58:43]

Done.

+    AudioIPCFactory::get()->MaybeDeregisterRemoteFactory(GetRoutingID());
+
   if (is_main_frame_) {
     // Ensure the RenderView doesn't point to this object, once it is destroyed.
     // TODO(nasko): Add a check that the |main_render_frame_| of |render_view_|
@@ -1295,6 +1299,12 @@ void RenderFrameImpl::Initialize() {
         GetRoutingID(), render_view_->GetRoutingID());
   }
 
+  // AudioIPCFactory may be null in tests.
+  if (AudioIPCFactory::get()) {
+    AudioIPCFactory::get()->MaybeRegisterRemoteFactory(GetRoutingID(),
+                                                       GetRemoteInterfaces());
+  }
+
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kDomAutomationController))