[chrome.displaySource] Move mojo interfaces to a nested namespace.

extensions/common/mojo/wifi_display_session_service.mojom

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module extensions;
+module extensions.mojom;
 
 struct WiFiDisplayMediaPacket {
   array<uint8> data;
 };
 
 // WiFiDisplaySessionService class provides access to the network for
 // the render-hosted Wi-Fi Display session.
 interface WiFiDisplaySessionService {
   SetClient(WiFiDisplaySessionServiceClient client);
 
@@ skipping 34 matching lines @@
 
 // This interface is used to send media stream to the
 // connected sink.
 interface WiFiDisplayMediaService {
   // Sets the destination point for sending media stream.
   SetDesinationPoint(string ip_address, int32 port) => (bool success);
 
   // Sends media packet to the destination point.
   SendMediaPacket(WiFiDisplayMediaPacket packet);
 };