Remove PosInSet and SetSize calculations from blink.

PosInSet and SetSize calculations were recently moved to the Browser
process, so there is no longer a need for these calculations in
blink. This change removes the uncessary blink code and updates
affected test cases.

Change-Id: Id227ff0fcc415fdce28149de51934d4e38af2f53
Reviewed-on: https://chromium-review.googlesource.com/c/1404259
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623346}
8 files changed