Move BroadcastChannel browser code from components/ to content/browser.

third_party/WebKit/public/platform/modules/broadcastchannel/broadcast_channel.mojom

 // Copyright 2016 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 webmessaging.mojom;
+module blink.mojom;
 
 import "url/mojo/origin.mojom";
 
 // A pair of BroadcastChannelClient interfaces is used to represent a connection
 // to a particular channel. One client is implemented in the browser, for
 // messages sent from the renderer to the browser, and one client is implemented
 // in the renderer for messages from the browser to the renderer.
 interface BroadcastChannelClient {
   // Messages are passed as SerializedScriptValue.
   OnMessage(string message);
 };
 
 // This interface is used to set up connections to broadcast channels. All
 // connections to channels made from the same event loop should be made
 // through the same BroadcastChannelProvider connection to ensure correct
 // ordering of messages.
 // Typically the browser will have one instance of a BroadcastChannelProvider
 // per storage partition, to which all connections from renderers in that
 // partition are bound. This instance will then forward messages received on a
 // particular connection to all other connections in the same storage partition
 // with the same origin and name.
 interface BroadcastChannelProvider {
   // Connect to the channel identified by the |origin| and |name|. Messages can
   // be sent to the channel using |sender|, and messages to the channel will be
   // received by |receiver|.
   ConnectToChannel(url.mojom.Origin origin, string name,
                    associated BroadcastChannelClient receiver,
                    associated BroadcastChannelClient& sender);
 };