CSS style to make HTML5 <wbr> work on IE 8-11

(Note that using the zero-width space directly is roughly equivalent;
see https://en.wikipedia.org/wiki/Zero-width_space )

Bug: 65155
Change-Id: I53f62fdb26cec65a3f4a5bea1bb9b1d7a9cb9c13
Merge "CSS style to make HTML5 <wbr> work on IE 8-11"