Fix userVisibility for files in ChromeOS filesystems.

Source/modules/filesystem/DOMFileSystemBase.h

Index: Source/modules/filesystem/DOMFileSystemBase.h
diff --git a/Source/modules/filesystem/DOMFileSystemBase.h b/Source/modules/filesystem/DOMFileSystemBase.h
index abe2e55aa363dd01c4967402453addabc64ef427..f488837a3687f1001d9b56d8ff03c61e5caf736d 100644
--- a/Source/modules/filesystem/DOMFileSystemBase.h
+++ b/Source/modules/filesystem/DOMFileSystemBase.h
@@ -49,7 +49,9 @@ class EntriesCallback;
 class EntryBase;
 class EntryCallback;
 class ErrorCallback;
+class File;
 class FileError;
+struct FileMetadata;
 class MetadataCallback;
 class ExecutionContext;
 class SecurityOrigin;
@@ -101,6 +103,7 @@ public:
     KURL createFileSystemURL(const String& fullPath) const;
     static bool pathToAbsolutePath(FileSystemType, const EntryBase*, String path, String& absolutePath);
     static bool pathPrefixToFileSystemType(const String& pathPrefix, FileSystemType&);
+    static PassRefPtrWillBeRawPtr<File> createFile(const FileMetadata&, const KURL& fileSystemURL, FileSystemType, const String name);
 
     // Actual FileSystem API implementations. All the validity checks on virtual paths are done at this level.
     void getMetadata(const EntryBase*, PassOwnPtrWillBeRawPtr<MetadataCallback>, PassOwnPtrWillBeRawPtr<ErrorCallback>, SynchronousType = Asynchronous);