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This removes the fuchsia sub-namespace from the following classes:
-ScopedServiceBinging
-ScopedServicePublisher
-ServiceDirectoryTestBase

A ::base::fuchsia pseudonym is left in place for these classes for the
duration of the transition.

In addition, this CL removes an unused source file.

Bug: 1073821
Change-Id: I2c0bb6215e9bc073ec03b37834a887457ebcff38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2602596
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843144}