file_manager: Remove MountEvent and VolumeInfo types from private API

chrome/common/extensions/api/file_browser_private.json

Index: chrome/common/extensions/api/file_browser_private.json
diff --git a/chrome/common/extensions/api/file_browser_private.json b/chrome/common/extensions/api/file_browser_private.json
index 2205e7b5ef8ab7cb790b5bed35df66d944846893..377cd31c7da6b3b2aaff83a7df4c9a5f933d5851 100644
--- a/chrome/common/extensions/api/file_browser_private.json
+++ b/chrome/common/extensions/api/file_browser_private.json
@@ -39,38 +39,6 @@
         }
       },
       {
-        "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.",
@@ -236,22 +204,6 @@
         }
       },
       {
-        "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.",