Files.app: Stop to use file system URLs having externalfile:// scheme origin internally.

chrome/browser/chromeos/fileapi/file_system_backend.cc

 // Copyright 2013 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.
 
 #include "chrome/browser/chromeos/fileapi/file_system_backend.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chromeos/fileapi/file_access_permissions.h"
@@ skipping 163 matching lines @@
     return false;
 
   std::string extension_id = url.origin().host();
   // TODO(mtomasz): Temporarily whitelist TimeScapes. Remove this in M-31.
   // See: crbug.com/271946
   if (extension_id == "mlbmkoenclnokonejhlfakkeabdlmpek" &&
       url.type() == storage::kFileSystemTypeRestrictedNativeLocal) {
     return true;
   }
 
-  // Grant access for URL having "externalfile:" scheme. The URL
-  // filesystem:externalfile:/xxx cannot be parsed directly. The URL is created
-  // only by DriveURLRequestJob.
-  if (url.origin().scheme() == chrome::kExternalFileScheme)
-    return true;
-
   // Check first to make sure this extension has fileBrowserHander permissions.
   if (!special_storage_policy_.get() ||
       !special_storage_policy_->IsFileHandler(extension_id))
     return false;
 
   return file_access_permissions_->HasAccessPermission(extension_id,
                                                        url.virtual_path());
 }
 
 void FileSystemBackend::GrantFullAccessToExtension(
@@ skipping 233 matching lines @@
     case storage::kFileSystemTypeRestrictedNativeLocal:
       callback.Run(GURL());
       return;
     default:
       NOTREACHED();
   }
   callback.Run(GURL());
 }
 
 }  // namespace chromeos