Re-commit: Introduce RemoveChromeTaskbarShortcuts() to delete all pinned-to-taskbar shortcuts owned by the uninstalled Chrome.

Original commit http://crrev.com/165505
Reverted in http://crrev.com/165524

BUG=158632
TEST=No user-level shortcut Chrome left behind in taskbar post user-level self-destruct.

Review URL: https://chromiumcodereview.appspot.com/11368040

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166285 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed