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This CL is a pure refactoring that aims to simplify ElementFinder by
removing the current_match_arrays_ field.

Instead, ElementFinder now stores all current matches in
current_matches_. If a filter returns more than one match in a JS array,
then this array will be directly resolved and the elements it contains
will be added to current_matches_.

This should make it easier to make ElementFinder return multiple
elements matching a selector in the same order than they have in the
document. See [1] for more background on why we would need that.

[1] https://docs.google.com/document/d/167LaI_WQNr31wBuO3DNlCPD2sx3If2GOHpPsT4atXIk/

Change-Id: I859183d48e0ed85de111c6d7bf0a497363c4e230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510331
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824046}