Show the eject button only for removabled and file handlers.

third_party/closure_compiler/externs/file_manager_private.js

 // Copyright 2014 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.
 
 /** @fileoverview Externs generated from namespace: fileManagerPrivate */
 
 /**
  * @typedef {{
  *   taskId: string,
  *   title: string,
@@ skipping 42 matching lines @@
  *   isCurrentProfile: boolean
  * }}
  */
 var ProfileInfo;
 
 /**
  * @typedef {{
  *   volumeId: string,
  *   fileSystemId: (string|undefined),
  *   extensionId: (string|undefined),
+ *   source: string,
  *   volumeLabel: (string|undefined),
  *   profile: ProfileInfo,
  *   sourcePath: (string|undefined),
  *   volumeType: string,
  *   deviceType: (string|undefined),
  *   devicePath: (string|undefined),
  *   isParentDevice: (boolean|undefined),
  *   isReadOnly: boolean,
  *   hasMedia: boolean,
+ *   configurable: boolean,
  *   mountCondition: (string|undefined),
  *   mountContext: (string|undefined)
  * }}
  */
 var VolumeMetadata;
 
 /**
  * @typedef {{
  *   eventType: string,
  *   status: string,
@@ skipping 550 matching lines @@
 chrome.fileManagerPrivate.onPreferencesChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDriveConnectionStatusChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDeviceChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDriveSyncError;