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I should come up with a better name than LayoutTestController{Host,} for content_shell

The extension docs are updated here: https://chromiumcodereview.appspot.com/10825200/

The binaries in chrome/test/data/extensions/uitest don't actually invoke LTC

BUG=none
TEST=still works after WK roll


Review URL: https://chromiumcodereview.appspot.com/10827182

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150320 0039d316-1c4b-4281-b951-d872f2087c98