[Cross-Site Isolation] Migrate entire MediaStream verticals to be per-RenderFrame.

content/renderer/media/media_stream_audio_source.cc

Index: content/renderer/media/media_stream_audio_source.cc
diff --git a/content/renderer/media/media_stream_audio_source.cc b/content/renderer/media/media_stream_audio_source.cc
index 069f4e3825dfc2797ed97d42b3971dfa1a91fb9d..d98855220d8603596f1340900a63ce634aebc39b 100644
--- a/content/renderer/media/media_stream_audio_source.cc
+++ b/content/renderer/media/media_stream_audio_source.cc
@@ -4,14 +4,28 @@
 
 #include "content/renderer/media/media_stream_audio_source.h"
 
+#include "content/renderer/render_frame_impl.h"
+#include "content/renderer/render_view_impl.h"
+
 namespace content {
 
+namespace {
+// TODO(miu): This is a temporary hack until the Chrome audio vertical is
+// migrated for the Cross-Site Isolation project.  http://crbug.com/392596
+int ToRenderViewId(int render_frame_id) {
+  RenderFrameImpl* const frame =
+      RenderFrameImpl::FromRoutingID(render_frame_id);
+  RenderViewImpl* const view = frame ? frame->render_view() : NULL;
+  return view ? view->GetRoutingID() : -1;
+}
+}  // namespace
+
 MediaStreamAudioSource::MediaStreamAudioSource(
-    int render_view_id,
+    int render_frame_id,
     const StreamDeviceInfo& device_info,
     const SourceStoppedCallback& stop_callback,
     PeerConnectionDependencyFactory* factory)
-    : render_view_id_(render_view_id),
+    : render_view_id_(ToRenderViewId(render_frame_id)),
       factory_(factory) {
   SetDeviceInfo(device_info);
   SetStopCallback(stop_callback);