Revert 230227 "Implement app list folder management page UI, inc..."

It caused use-after-frees at
http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%283%29/builds/29082/steps/memory%20test%3A%20ash_unittests/logs/stdio

> Implement app list folder management page UI, including the following feature:
> 1. Clicking on a folder item in the app list grid will open the app list folder management page to show the folder name and items in the folder.
> 2. User can click on the back button on folder management page to navigate back to the app list page.
> 3. User can change the app list folder name on folder management page.
> 
> BUG=303224
> TBR=sky
> 
> Review URL: https://codereview.chromium.org/27777002

TBR=jennyz@chromium.org

Review URL: https://codereview.chromium.org/35783003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230256 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230256