Removing shortcut deletion code in uninstall for legacy App Launcher.

The legacy App Launcher product has shortcut-deletion code during uninstall. This code was useless, and now harmful as it triggers DCHECK().


BUG=297645

Review URL: https://codereview.chromium.org/25722018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227077 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227077