Reland: Link the name of the extension on the management page to the

gallery page, if the extension is from the gallery.

BUG=29739
TEST=Install a gallery extension and a third-party extension and make sure the
gallery extension name is a link (whereas the third party extension name is
static text).

Review URL: http://codereview.chromium.org/1780009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@45807 0039d316-1c4b-4281-b951-d872f2087c98