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Duplicates of kTrafficAnnotation and g_is_fake_official_build_for_testing
just appeared and caused problems for certain (extreme) jumbo build
configurations.

In jumbo builds much code is compiled in the same translation
unit which means that they share the same anonymous namespace.

This patch renames the variables following the pattern of similar clashes.

(nopresubmit because any changes to net::URLFetcher are currently
 blocked and this just changes a name)

NOPRESUBMIT=true

Change-Id: Ib55f61c2c8a76c235de45f509df493c875a3a12b
Reviewed-on: https://chromium-review.googlesource.com/992313
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548379}