Refactored shortcut creation in AppListControllerDelegate.

Moved DoCreateShortcutsFlow from AppListControllerDelegate subclasses to
the base class. Previously, Win and Mac had separate implementations,
and Ash had no implementation.

BUG=307837

Review URL: https://codereview.chromium.org/27545003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230009 0039d316-1c4b-4281-b951-d872f2087c98
Make CLD2 default on the desktop platforms. We'd like to use CLD2 as of M32.

BUG=240647

Review URL: https://codereview.chromium.org/31443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230010 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230010