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This reverts commit fb941d6f.

Reason for revert: Compile failure on internal builders.

Bug: 919777

Original change's description:
> Add --merge-base-ref option to lastchange.py
> 
> This option allows the chromecast platform team to remove some custom
> logic in favor of a general flag that anyone can use. The
> --merge-base-ref flag takes a ref, such as
> "origin/chromium/src" and limits lastchange's calculations to the merge
> base between HEAD and that ref
> 
> As part of this commit I simplified the VersionInfo class because it
> didn't need the aditional complexity of not being named-tuple. After a
> review of the various uses of RunGitCommand it seemed prudent to fold
> in the returncode and error checking into the RunGitCommand function
> to simplify the rest of the code.
> 
> This commit also moves towards a model of failing early and providing
> messaging to the user about why the command failed. This led to
> factoring out the FetchVersionInfo function which no longer does useful
> work and to calculating the git top directory early in the process and
> using it throughout.
> 
> Bug: 917159
> Test: None
> Change-Id: If58a956f51ccc019c7be860227a0039cdc0709b8
> Reviewed-on: https://chromium-review.googlesource.com/c/1387690
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
> Commit-Queue: Eli Ribble <eliribble@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#620447}

TBR=dpranke@chromium.org,tandrii@chromium.org,eliribble@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 917159
Change-Id: Id6134dad46603cb056f8351279b5522c3c6f151d
Reviewed-on: https://chromium-review.googlesource.com/c/1400836Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620881}