Add a virtual destructor to PermissionPromptDelegate

chrome/browser/media/webrtc/media_stream_devices_controller.h

Index: chrome/browser/media/webrtc/media_stream_devices_controller.h
diff --git a/chrome/browser/media/webrtc/media_stream_devices_controller.h b/chrome/browser/media/webrtc/media_stream_devices_controller.h
index 2c6d996243e75125c5f158e376bac1b69605a0ae..45af8ed4fcf7c24f0a2b177e6a0bc187ee38d47b 100644
--- a/chrome/browser/media/webrtc/media_stream_devices_controller.h
+++ b/chrome/browser/media/webrtc/media_stream_devices_controller.h
@@ -91,6 +91,7 @@ class MediaStreamDevicesController {
         bool user_gesture,
         content::WebContents* web_contents,
         std::unique_ptr<MediaStreamDevicesController::Request> request) = 0;
+    virtual ~PermissionPromptDelegate() {}
   };
 
   static void RequestPermissions(