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This adds the file as an EG2 target, updates #includes, and replaces
calls to helpers that can't be used in EG2.

This also adds a webStateLastCommittedURL method to ChromeEarlGrey.

Bug: 987646
Change-Id: Ib98baad37b422b36a216b7915a0594b0e76c4062
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947048Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721126}