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Removing "using namespace" in a global scope in autofill

"using namespace" in a global scope breaks jumbo builds (and
are not allowed in the code style guide). This patch replaces them
with explicit namespaces.

Bug: 771153
Change-Id: Ic45f740d8081b9f4e531b30ac05f6578a404de11
Reviewed-on: https://chromium-review.googlesource.com/697371
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506367}