Move ensure keyboard mic check in MediaStreamManager to SetupRequest.

content/browser/renderer_host/media/media_stream_manager.h

Index: content/browser/renderer_host/media/media_stream_manager.h
diff --git a/content/browser/renderer_host/media/media_stream_manager.h b/content/browser/renderer_host/media/media_stream_manager.h
index a8c859289e63144e3534c8ee6058be6b9fe948e0..e23c73ba901fe9d774bda412d17594c680124f3f 100644
--- a/content/browser/renderer_host/media/media_stream_manager.h
+++ b/content/browser/renderer_host/media/media_stream_manager.h
@@ -364,6 +364,11 @@ class CONTENT_EXPORT MediaStreamManager
                                gfx::NativeViewId window_id);
 
 #if defined(OS_CHROMEOS)
+  // Ensures that we have checked for presence of a keyboard mic. This is only
+  // done once. This function should be called before posting a request on the
+  // UI thread.
+  void EnsureKeyboardMicChecked();
+
   // Checks if the system has a keyboard mic, and if so, inform the audio
   // manager via SetKeyboardMicOnDeviceThread().
   void CheckKeyboardMicOnUIThread();