Whitelist fileSystemProvider API to Secure Shell app

chrome/common/extensions/api/_permission_features.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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and base_feature_provider.h.
 
 // If you add a new platform_app permission please update the "stubs_app" test:
@@ skipping 384 matching lines @@
       "D5736E4B5CF695CB93A2FB57E4FDC6E5AFAB6FE2",  // http://crbug.com/312900
       "D57DE394F36DC1C3220E7604C575D29C51A6C495",  // http://crbug.com/319444
       "3F65507A3B39259B38C8173C6FFA3D12DF64CCE9"   // http://crbug.com/371562
     ]
   }],
   "fileSystem.requestFileSystem": [{
     "channel": "stable",
     "extension_types": ["platform_app"],
     "platforms": ["chromeos"]
   }],
-  "fileSystemProvider": {
+  "fileSystemProvider": [{
     "channel": "stable",
     "extension_types": ["extension", "platform_app"],
     "platforms": ["chromeos"]
-  },
+  }, {
+    "channel": "stable",
+    "extension_types": ["legacy_packaged_app"],
+    "platforms": ["chromeos"],
+    "whitelist": [
+      "0EA6B717932AD64C469C1CCB6911457733295907",  // http://crbug.com/673004
+      "58B0C2968C335964D5433E89CA4D86628A0E3D4B"   // http://crbug.com/673004
+    ]
+  }],
   "firstRunPrivate": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "location": "component",
     "platforms": ["chromeos"]
   },
   "fontSettings": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
@@ skipping 522 matching lines @@
     "channel": "stable",
     "extension_types": ["platform_app"],
     "platforms": ["chromeos"],
     "whitelist": [
       "A948368FC53BE437A55FEB414106E207925482F5",  // Files app
       "8C726564C6DBE7380BAB388DE6CC7EC93EB44B06",  // Video player
       "5065C83E84321221675D20FBE4DC43C655CC8C6F"   // Files app tests
     ]
   }
 }