Ensure that WebRTC AEC recording checkbox is not set if cancelling file dialog.

content/browser/media/webrtc_internals.cc

Index: content/browser/media/webrtc_internals.cc
diff --git a/content/browser/media/webrtc_internals.cc b/content/browser/media/webrtc_internals.cc
index 4f64ccef8c34769c2f33cbb34bd15ca738ab5cc6..8ded1a0c4360a32c115283c8e1f6b2272346dc7b 100644
--- a/content/browser/media/webrtc_internals.cc
+++ b/content/browser/media/webrtc_internals.cc
@@ -289,6 +289,12 @@ void WebRTCInternals::FileSelected(const base::FilePath& path,
 #endif
 }
 
+void WebRTCInternals::FileSelectionCanceled(void* params) {
+#if defined(ENABLE_WEBRTC)
+  SendUpdate("aecRecordingFileSelectionCancelled", NULL);
+#endif
+}
+
 void WebRTCInternals::OnRendererExit(int render_process_id) {
   // Iterates from the end of the list to remove the PeerConnections created
   // by the exitting renderer.