Remove Chromecast extension support from cast system tray menu.

chrome/common/extensions/api/cast_devices_private.idl

-// 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.
-
-// The <code>chrome.cast.devicesPrivate</code> API manages starting and stopping
-// casts based on receiver names. It also provides a list of available
-// receivers.
-namespace cast.devicesPrivate {
-  // A cast receiver is an actual cast device. It has a unique |id| and a
-  // non-unique |name| which is how people identify it.
-  dictionary Receiver {
-    // The unique id of a receiver.
-    DOMString id;
-
-    // The human-readable name of the receiver.
-    DOMString name;
-  };
-
-  // An activity represents what a receiver is currently doing.
-  dictionary Activity {
-    // The unique id for the activity.
-    DOMString id;
-
-    // The human-readable title of the activity.
-    DOMString title;
-
-    // Where did this activity originate from? For >=0 values, then this is the
-    // tab identifier. For <0 values, each value has a special meaning. If the
-    // cast was started on another device, there is no tabId.
-    long? tabId;
-  };
-
-  // A receiver with its associated activity. This is a 1-1 mapping.
-  dictionary ReceiverActivity {
-    // The current receiver.
-    Receiver receiver;
-
-    // Its associated activity, if any.
-    Activity? activity;
-  };
-
-  interface Functions {
-    // Update the state of all of the cast devices and their associated
-    // activities.
-    //
-    // |devices|: Every single receivers with its associated activities, if any.
-    static void updateDevices(ReceiverActivity[] devices);
-  };
-
-  interface Events {
-    // Request a refresh of the device states.
-    [maxListeners=1] static void updateDevicesRequested();
-
-    // Stops a cast. This should always be a user-initiated stop.
-    static void stopCast(DOMString reason);
-
-    // Starts a new cast.
-    //
-    // |receiverId|: The receiver ID to initiate a cast on. The implementation
-    // will handle selecting an appropriate activity.
-    static void startCast(DOMString receiverId);
-  };
-};