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base::Hash() is deprecated and is being replaced by base::FastHash().
The output of base::FastHash() is only fixed within the lifetime of a
single process, so if the code depends on the mapping of inputs to hash
outputs not changing over time, base::PersistentHash() must be used
instead.

Notes:
- Add a base::PersistentHash() overload that takes a base::span to
  match base::FastHash().
- Fixes tracing ID generation to use base::PersistentHash(), since
  the tracing IDs are not always generated in the same process.

Bug: 1025358, 1026837
Change-Id: Ibdfe5185c0a8fdb9ab2fd2ee7408ea73e842801b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1923499
Auto-Submit: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718400}