Fix two bugs in chrome://extensions/:

* CHECK when reloading installed extension. Caused because we
  were somtimes trying to register for the same notifications
  twice.

* Not able to "Reload" extensions that were loaded with
  "Load Unpacked Extension".

[email protected]

Review URL: http://codereview.chromium.org/178033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@24882 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed