Disable row stretching for tables crossing fragmentainer boundaries.

Edge also does this.

Allowing rows to be stretched and thus moved after fragmentation would require
us to re-fragment (since the fragmentainer boundaries would be elsewhere, due
to row stretching), then re-stretch, the re-re-fragment, and so on (cyclic
dependencies).

BUG=534751

Review-Url: https://codereview.chromium.org/2421133002
Cr-Commit-Position: refs/heads/master@{#425705}
3 files changed