GitLab

Allow enhanced bookmarks external component extensions to be
disabled/uninstalled. This facilitates ongoing development and testing
of multiple versions of extensions that are ultimately released as
external component extensions.

BUG=401315

Review URL: https://codereview.chromium.org/445233002

Cr-Commit-Position: refs/heads/master@{#289270}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289270 0039d316-1c4b-4281-b951-d872f2087c98