Prepare chrome for inspector_protocol using std::span<>.

-- std::span<T>::data() cast can trigger unsafe buffer warnings.
-- Fix cast of iterator to ptr missed in prior Cl since some files
   are part of chromium despite residing under third_party.

Change-Id: I903e7a3c7f9dba77054839f88de2b99cb17fb26d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6221212
Reviewed-by: Alex Rudenko <alexrudenko@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1415017}