Extract external file systems handling from isolated context.

webkit/fileapi/mount_points.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/mount_points.h"
+
+#include "webkit/fileapi/file_system_types.h"
+
+namespace fileapi {
+
+MountPoints::MountPointInfo::MountPointInfo() {}
+MountPoints::MountPointInfo::MountPointInfo(
+    const std::string& name, const FilePath& path)
+    : name(name), path(path) {}
+
+// static
+bool MountPoints::HasMountPointsImplementation(FileSystemType type) {
+  return type == kFileSystemTypeIsolated ||
+         type == kFileSystemTypeExternal;
+}
+
+}  // namespace fileapi