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The previous implementation used a differing strategy
based on the optional selector. This CL changes to use
the |EvaluateParams| based approach for both cases.

This is step 1 in a plan to refactor
* WaitForDocumentReadyState
* WaitForDocumentToBecomeInteractive
to become one.

Bug: b/172542134
Change-Id: I5d8cd765e4cb4e922bd3f5e65a03678caa0d52c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523176
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825707}