Check media permissions through RenderFrameHostDelegate.

extensions/browser/app_window/app_web_contents_helper.h

Index: extensions/browser/app_window/app_web_contents_helper.h
diff --git a/extensions/browser/app_window/app_web_contents_helper.h b/extensions/browser/app_window/app_web_contents_helper.h
index 3d17851b451319f935e4775345a7b15381ee248f..ea4f13e55f5d93d31c7b418b1a66aeda62c808d7 100644
--- a/extensions/browser/app_window/app_web_contents_helper.h
+++ b/extensions/browser/app_window/app_web_contents_helper.h
@@ -48,6 +48,11 @@ class AppWebContentsHelper {
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) const;
 
+  // Checks permission to use the camera or microphone. See
+  // WebContentsDelegate.
+  bool CheckMediaAccessPermission(const GURL& security_origin,
+                                  content::MediaStreamType type) const;
+
  private:
   const Extension* GetExtension() const;