Revert "Collapsed space never worked properly if we have spaces inside and/or after a Bidi-isolate."

This reverts commit d1cf2bc1fb535d697d9060d9f8d5aa5906558ceb as it caused a regression.

BUG=306802
R=inferno@chromium.org

Review URL: https://codereview.chromium.org/27196005

git-svn-id: svn://svn.chromium.org/blink/trunk@159601 bbb929c8-8fbe-4397-9dbb-9b2b20218538