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This CL consolidates the code to use base::span to pass indexed ruleset data
buffer, doing away with FlatRulesetIndexer::SerializedData. It provides for more
readable code.

BUG=696822

Change-Id: I382eec8328fb82af74bbd49e483304329d8c4bf7
Reviewed-on: https://chromium-review.googlesource.com/1152869Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584621}