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Webdriver standard has updated handling for contenteditable,
specifically, only for element that was not focuses would
we move the caret to the end of children.

Modified test to reflect

Bug: chromedriver:3214
Change-Id: I123a7cb3569ad82c3c30d180abfdeaa3b0c8204c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2203288Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#770330}