Add AudioStreamRegistry. Move stream counting logic

content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc

Index: content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc b/content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc
index 3a626163e5938976a9efdeb076d290bee4612463..b84ca045b2212dca1555009682dfac3e9d59762f 100644
--- a/content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc
+++ b/content/browser/renderer_host/media/audio_input_renderer_host_unittest.cc
@@ -53,11 +53,13 @@ const int kRendererPid = 21718;
 const int kRenderFrameId = 31415;
 const int kSharedMemoryCount = 11;
 const char kSecurityOrigin[] = "http://localhost";
+#if BUILDFLAG(ENABLE_WEBRTC)
 #if defined(OS_WIN)
 const wchar_t kBaseFileName[] = L"some_file_name";
 #else
 const char kBaseFileName[] = "some_file_name";
 #endif
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
 
 url::Origin SecurityOrigin() {
   return url::Origin(GURL(kSecurityOrigin));