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This change adds ExplicitArgumentBarrier to base::make_span, blocking
callers from explicitly specifying types the compiler can deduce for
them. It also performs some other minor clean-ups in effected code,
such as getting rid of base::make_span completely when an implicit
conversion would have been performed anyway.

TBR=khushalsagar,caseq,mcasas,kouhei,rockot@google.com

Bug: 828324

Change-Id: I4c462b9802c477baf6f601ee5651a90a6d929fbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871699
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709426}