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Besides normalizing the histograms paths in the index file, we also need
to normalize all paths in the |histogram_paths.HISTOGRAMS_XMLS_RELATIVE|
because it contains a hardcode path.

Change-Id: I820de86efc7b816c0dba52e42838cbc55b5319c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386837
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803406}