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Add all members to chrome_browser_net namespace.
Change IsValidDohTemplate() name to be DoH specific.

Change-Id: I68cf5d2ce3a987b2e0f000ebd125a4ef490d7237
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764899
Commit-Queue: Steven Bingler <bingler@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690874}