Revert 226547 "Refactor LauncherItemController and LauncherItemD..."

> Refactor LauncherItemController and LauncherItemDelegate
> 
> * Remove LauncherItem parameter of LauncherItemDelegate method
> * LauncherItemController subclasses LauncherItemDelegate
> * Register/Unregister when LauncherItemDelegate is created/removed
> * LauncherItemDelegateManager handles LauncherItemDelegate by LauncherID
> * LauncherItemDelegateManager take ownership of all LauncherItemDelegate
> 
> R=sky@chromium.org, skuhne@chromium.org
> BUG=279105
> TEST=unit_tests, browser_tests, ash_unittests, ash_shell
> 
> Review URL: https://codereview.chromium.org/23606016

TBR=simon.hong81@gmail.com

Review URL: https://codereview.chromium.org/25716004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226580 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226580