Bookmark manager: make Organized menu commands to work.

Since rev 167360, change focus handling for a11y, list view and tree view aren't active element when executing command from [Organized] menu.

This patch changes to use global variable |list| instead of document.activeElement if activeElement isn't tree view.

* list 'canExecute' event handler: Changed to call canExecuteForList().
* canExecuteForList(): Copied list 'canExecute' event handler and to use |list|.
* organizeButton 'canExecute' event handler: Update sort-command canExecute even if canEdit isn't changed.
* document 'command' event handler: Changed to call handleCommand()
* getSelectedBoomarkNodes(): Changed to handle activeElement is neither list or tree.
* handleCommand(): Changed to handle all commands rather than list and tree context menus.


BUG=165075
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=172230

[yosin_UTC9, 2012-12-10 05:12:01]

Hi Eric,
Could you review this patch?
Thanks in advance.

[arv (Not doing code reviews), 2012-12-10 19:59:16]

LGTM