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A temporary network traffic annotation tag is added to be used during
refactoring of the socket classes. Network Traffic Annotation Auditor
is updated to add this tag to reserved words and ignore it in tests.

Bug: 690323
Change-Id: I79f570ced37a8572b6f495de478d18d998dc4189
Reviewed-on: https://chromium-review.googlesource.com/813674Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522391}