Convert some "unsafe" make_span() calls to span_from_ref()

This will facilitate removing unsafe_buffer usage in the future.

Fully automated change.

Change-Id: I0d5f0369fe002a61d6da83db807612cf6a51c064
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5758178
Owners-Override: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1336912}

components/power_metrics/energy_metrics_provider_linux.cc

@@ -123,7 +123,7 @@ EnergyMetricsProviderLinux::CaptureMetrics() {
     uint64_t absolute_energy;
     if (!base::ReadFromFD(
             event.fd.get(),
-            base::as_writable_chars(base::make_span(&absolute_energy, 1u)))) {
+            base::as_writable_chars(base::span_from_ref(absolute_energy)))) {
       LOG(ERROR) << "Failed to read absolute energy of " << event.metric_type;
       continue;
     }