Remove confusing version qualitication from chrome.app.filesystem docs.

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.
 
 // Use the <code>chrome.fileSystem</code> API to create, read, navigate,
 // and write to the user's local file system. With this API, Chrome Apps can
 // read and write to a user-selected location. For example, a text editor app
 // can use the API to read and write local documents. All failures are notified
 // via chrome.runtime.lastError.
 namespace fileSystem {
@@ skipping 89 matching lines @@
 
     // Gets whether this Entry is writable or not.
     static void isWritableEntry([instanceOf=Entry] object entry,
                                 IsWritableCallback callback);
 
     // Ask the user to choose a file or directory.
     static void chooseEntry(optional ChooseEntryOptions options,
                             EntriesCallback callback);
 
     // Returns the file entry with the given id if it can be restored. This call
-    // will fail with a runtime error otherwise. This method is new in Chrome
-    // 31.
+    // will fail with a runtime error otherwise.
     static void restoreEntry(DOMString id, EntryCallback callback);
 
     // Returns whether the app has permission to restore the entry with the
-    // given id. This method is new in Chrome 31.
+    // given id.
     static void isRestorable(DOMString id, IsRestorableCallback callback);
 
     // Returns an id that can be passed to restoreEntry to regain access to a
     // given file entry. Only the 500 most recently used entries are retained,
     // where calls to retainEntry and restoreEntry count as use. If the app has
     // the 'retainEntries' permission under 'fileSystem', entries are retained
     // indefinitely. Otherwise, entries are retained only while the app is
-    // running and across restarts. This method is new in Chrome 31.
+    // running and across restarts.
     static DOMString retainEntry([instanceOf=Entry] object entry);
   };
 };