Extract external file systems handling from isolated context.

webkit/fileapi/syncable/syncable_file_system_util.cc

 // 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.
 
 #include "webkit/fileapi/syncable/syncable_file_system_util.h"
 
+#include "webkit/fileapi/external_mount_points.h"
 #include "webkit/fileapi/file_observers.h"
 #include "webkit/fileapi/file_system_context.h"
 #include "webkit/fileapi/file_system_util.h"
-#include "webkit/fileapi/isolated_context.h"
 #include "webkit/fileapi/sandbox_mount_point_provider.h"
 
 namespace fileapi {
 
 bool RegisterSyncableFileSystem(const std::string& service_name) {
-  return IsolatedContext::GetInstance()->RegisterExternalFileSystem(
+  return ExternalMountPoints::GetSystemInstance()->RegisterFileSystem(
       service_name, kFileSystemTypeSyncable, FilePath());
 }
 
 bool RevokeSyncableFileSystem(const std::string& service_name) {
-  return IsolatedContext::GetInstance()->RevokeFileSystem(service_name);
+  return ExternalMountPoints::GetSystemInstance()->RevokeFileSystem(
+      service_name);
 }
 
 GURL GetSyncableFileSystemRootURI(const GURL& origin,
                                   const std::string& service_name) {
   const GURL url = GetFileSystemRootURI(origin, kFileSystemTypeExternal);
   const std::string path = service_name + "/";
   url_canon::Replacements<char> replacements;
   replacements.SetPath(path.c_str(), url_parse::Component(0, path.length()));
   return url.ReplaceComponents(replacements);
 }
@@ skipping 32 matching lines @@
 }
 
 LocalFileSystemOperation*
 CreateFileSystemOperationForSync(FileSystemContext* file_system_context) {
   DCHECK(file_system_context);
   return file_system_context->sandbox_provider()->
       CreateFileSystemOperationForSync(file_system_context);
 }
 
 }  // namespace fileapi