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Before this patch, the client and server protos differed in the fields ids and the
structure of the element to wait for. This resulted in selectors being empty and
timeout values off.

This patch fixes the numbering and replaces the element field with a
repeated string field.

After this patch, WaitForDomProto messages can properly be parsed.

Props to szermatt@ for finding this difference.

R=rouslan@chromium.org

Bug: 806868
Change-Id: Ib2c9822c6ef24001706b78c339f3d4b97c3aa947
Reviewed-on: https://chromium-review.googlesource.com/1249274
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595021}