Clicking a "javascript:" link opens an internal html page.

This patch makes "javascript:" links non-navigable.

BUG=280918

Review URL: https://chromiumcodereview.appspot.com/23716003

git-svn-id: svn://svn.chromium.org/blink/trunk@157124 bbb929c8-8fbe-4397-9dbb-9b2b20218538