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Currently Embed element with children in different tree are treated as
an empty object. It's because IsEmptyObjectReplacedByCharacter() calls
AnchorUnignoredChildCount() to see if an element has any children. This
call doesn't check if the element has a child tree. This results in
incorrect range calculation for PDF documents.

This CL adds a check in IsEmptyObjectReplacedByCharacter() that an Embed
element with non empty children including child tree should not be
treated as an empty object.

Bug: 1131507
Change-Id: I0fb2572a80c304c7cee35f68062321e09b78ed62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449670
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817501}