Rename chrome.fileSystem apis to be expandable to directories if we wish.

chrome/common/extensions/api/file_system.idl

 // 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.
 
 namespace fileSystem {
   dictionary AcceptOption {
     // This is the optional text description for this option. If not present,
     // a description will be automatically generated; typically containing an
     // expanded list of valid extensions (e.g. "text/html" may expand to
     // "*.html, *.htm").
     DOMString? description;
 
     // Mime-types to accept, e.g. "image/jpeg" or "audio/*". One of mimeTypes or
     // extensions must contain at least one valid element.
     DOMString[]? mimeTypes;
 
     // Extensions to accept, e.g. "jpg", "gif", "crx".
     DOMString[]? extensions;
   };
 
-  dictionary ChooseFileOptions {
+  dictionary ChooseEntryOptions {
     // Type of the prompt to show. Valid types are 'openFile',
     // 'openWritableFile' or 'saveFile'.
     //
     // Both 'openFile' and 'openWritableFile' will prompt the user to open an
     // existing file, with 'openFile' returning a read-only FileEntry on
     // success. 'saveFile' will prompt the user to choose an existing file or
     // a new file, and will return a writable FileEntry.
     // Calls to chooseFile with either 'openWritableFile' or 'saveFile' will
     // fail unless the application has the 'write' permission under
     // 'fileSystem'.
@@ skipping 20 matching lines @@
 
   interface Functions {
     // Get the display path of a FileEntry object. The display path is based on
     // the full path of the file on the local file system, but may be made more
     // readable for display purposes.
     static void getDisplayPath([instanceOf=FileEntry] object fileEntry,
                                GetDisplayPathCallback callback);
 
     // Get a writable FileEntry from another FileEntry. This call will fail if
     // the application does not have the 'write' permission under 'fileSystem'.
-    static void getWritableFileEntry([instanceOf=FileEntry] object fileEntry,
-                                     FileEntryCallback callback);
+    static void getWritableEntry([instanceOf=FileEntry] object fileEntry,
+                                 FileEntryCallback callback);
 
     // Gets whether this FileEntry is writable or not.
-    static void isWritableFileEntry([instanceOf=FileEntry] object fileEntry,
-                                    IsWritableCallback callback);
+    static void isWritableEntry([instanceOf=FileEntry] object fileEntry,
+                                IsWritableCallback callback);
 
     // Ask the user to choose a file.
-    static void chooseFile(optional ChooseFileOptions options,
-                           FileEntryCallback callback);
+    static void chooseEntry(optional ChooseEntryOptions options,
+                            FileEntryCallback callback);
   };
 };