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 (1) Remove null checks for NetLogWithSource::IsCapturing()
 (2) Inline NetLogWithSource::IsCapturing()

This also results in a binary size reduction (546 bytes for Android Arm).

Bug: 1006900
Change-Id: I9a947885b3690f4bd8b6f429b5104998f9a3a346
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1819946
Commit-Queue: Eric Roman <eroman@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699502}