file_manager: Remove MountEvent and VolumeInfo types from private API

chrome/common/extensions/api/file_browser_private.json

 // Copyright (c) 2012 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.
 
 [
   {
     "namespace":"fileBrowserPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/chromeos/extensions/file_manager/file_browser_private_api_functions.h"
     },
@@ skipping 21 matching lines @@
             "type": "boolean",
             "description": "True if this is Drive App."
           },
           "isDefault": {
             "type": "boolean",
             "description": "True if this task is a default task for the selected files."
           }
         }
       },
       {
-        "id": "VolumeInfo",
-        "type": "object",
-        "description": "Mounted disk volume information.",
-        "properties": {
-          "mountPath": {
-            "type": "string",
-            "description": "Disk volume mount point path. The value corresponds to its Entry.fullPath in File API."
-          },
-          "devicePath": {
-            "type": "string",
-            "description": "Disk volume device path."
-          },
-          "label": {
-            "type": "string",
-            "description": "Volume label."
-          },
-          "deviceType": {
-            "type": "string",
-            "enum": ["sd", "usb", "optical", "mobile", "unknown"],
-            "description": "Device type."
-          },
-          "readOnly": {
-            "type": "boolean",
-            "description": "Flag that specifies if volume is mounted in read-only mode."
-          },
-          "totalSize": {
-            "type": "number",
-            "description": "Approximated total disk volume size in bytes."
-          }
-        }
-      },
-      {
         "id": "DriveEntryProperties",
         "type": "object",
         "description": "Drive file properties.",
         "properties": {
           "fileUrl": {
             "type": "string",
             "optional": true,
             "description": "the URL given for this file."
           },
           "thumbnailUrl": {
@@ skipping 145 matching lines @@
             "description": "Flag that specifies if volume is on boot device."
           },
           "totalSize": {
             "type": "integer",
             "optional": true,
             "description": "Total disk volume size."
           }
         }
       },
       {
-        "id": "MountEvent",
-        "type": "object",
-        "description": "Payload data for disk mount / unmount event.",
-        "properties": {
-          "eventType": {
-            "type": "string",
-            "enum": ["added", "removed"],
-            "description": "Event type that tells listeners which disk volume even was raised."
-          },
-          "volumeInfo": {
-            "$ref": "VolumeInfo",
-            "description":"Volume information that this mount event applies to."
-          }
-        }
-      },
-      {
         "id": "MountCompletedEvent",
         "type": "object",
         "description": "Payload data for mount event.",
         "properties": {
           "eventType": {
             "type": "string",
             "enum": ["mount", "unmount"],
             "description": "Is the event raised for mounting or unmounting."
           },
           "status": {
@@ skipping 1057 matching lines @@
       },
       {
         "name": "onDriveConnectionStatusChanged",
         "type": "function",
         "description": "Fired when the active network connection state changes. The network connection state can be retrieved via 'getDriveConnectionState'.",
         "parameters": []
       }
     ]
   }
 ]