Fix HarfBuzzShaper to apply vertical alternate glyphs in DefaultLangSys
Fix HarfBuzzShaper to apply vertical alternate glyphs in DefaultLangSys

This patch fixes HarfBuzzShaper to apply vertical alternate glyphs in
vertical flow when the used font has the 'vert' table only in
DefaultLangSys.

It looks like Adobe TypeKit subsetted Japanese fonts use this pattern,
probably in order to minimize the download font size.

BUG=470884

Review URL: https://codereview.chromium.org/1030323002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@192615 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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