Revert "Rate limit tree selection change side effects"

This reverts r246805.

The delay used for rate limiting the change caused the context menu to
stop working (it gets hidden when the list id changes).

BUG=339359, 336180
TBR=dbeam@chromium.org

Review URL: https://codereview.chromium.org/134073005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248528 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248528