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This CL updates DCHECK for checking the child count of the text
field on GetTextContainerForPlainTextField(). The text field
could have a sibling of the static text when it has a
placeholder break element. So, this change increases the child
count.

AX-Relnotes: n/a

Bug: 1137292
Change-Id: Ib6d6826ce23156e8d5562d9561ad8061d46b6946
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578718
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836355}