DevTools: [CSS] mark word-wrap and overflow-wrap as inherited poroperties

CSS spec http://www.w3.org/TR/css3-text/#overflow-wrap-property states
that word-wrap/overflow-wrap properties are inherited. The patch
adds them to the "inherited properties" list of CSSMetadata.

BUG=388427

Review URL: https://codereview.chromium.org/366233004

git-svn-id: svn://svn.chromium.org/blink/trunk@177540 bbb929c8-8fbe-4397-9dbb-9b2b20218538