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This patch fixes:
1. ::first-line style is not applied when there are other
   anonymous inline boxes.
2. Inspector getPlatformFonts protocol collects fonts from
   two levels deep. Changed the logic not to include
   anonymous boxes to the depth limit.

Also the incorrect expectation was fixed; legacy counts
glyphs in ::first-letter twice.

Bug: 636993, 714962
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: Ia028710b728e8e9172b540a46b42d804c9f57699
Reviewed-on: https://chromium-review.googlesource.com/1245078Reviewed-by: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594395}