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along with the "rebaseline-expectations" subcommand in blink_tool.py.

Also clean up the remaining references to NEEDS_MANUAL_REBASELINE left
from https://crrev.com/c/1140927.

Bug: 621126, 738152
Change-Id: I33c109e4343e7bf41aac6e7527237702e4cce94a
Reviewed-on: https://chromium-review.googlesource.com/1164405
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581366}