Include all schemes for webstore component app urls

      BUG=55002
TEST=type chrome.google.com/extensions into omnibox, open js console, verify that chrome.webstorePrivate object is defined

Review URL: http://codereview.chromium.org/3366018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@58970 0039d316-1c4b-4281-b951-d872f2087c98