Skip inlines when looking for first-letter layoutObjects.

When looking through the layout tree to determine where to insert
a first-letter layoutObject we would stop looking as soon as we
saw another layoutObject that specified first-letter.

This breaks if you have a block first-letter followed by an
inline first-letter as first-letter does not apply to inlines.

Make sure that we only stop looking if the layoutObject we've
found is not an inline.

BUG=464772

Review URL: https://codereview.chromium.org/1079583002

git-svn-id: svn://svn.chromium.org/blink/trunk@193564 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed