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Now that we've changed all web tests to use Element.innerText for text
dump, this patch removes the relevant plumbing code to finish.

Bug: 887148
Change-Id: Ic5e83d3cbeabaaba58927eb78e9977763867c7a6
Reviewed-on: https://chromium-review.googlesource.com/c/1366487
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614833}