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This reverts commit c7d0001d.

Reason for revert: May be causing test failures: https://bugs.chromium.org/p/chromium/issues/detail?id=1063167

Original change's description:
> Fix accessibility dump tree tests to not need an end-of-file sentinel.
> 
> The DumpAccessibilityTree tests generate an output text file and diff
> the results against an expected file. Previously, the way that the
> algorithm handled files of different lengths was by adding an
> end-of-file sentinel to the end. This resulted in that sentinel
> getting checked in, which was just confusing.
> 
> Fix this by modifying the DiffLines helper function to properly compare
> files that don't have the same number of lines. Add full unit tests for
> DiffLines so we can be confident it works.
> 
> Continue to LOG the end-of-file sentinel, because it's needed by
> running rebase_dump_accessibility_tree_test.py to parse actual output
> files from remote logs.
> 
> Bug: none
> Change-Id: If1bcef063822fd5786acaeff9133c05d5fc5b065
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109458
> Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Avi Drissman <avi@chromium.org>
> Auto-Submit: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#751791}

TBR=avi@chromium.org,dmazzoni@chromium.org,aleventhal@chromium.org

Change-Id: Ic369d42c9bd201792b03bcf995cb57ad3383b93a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111771Reviewed-by: Dan H <harringtond@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751854}