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This is renaming the out-of-process artifacts as `proxy`, to indicate
that they are communicating via RPC with the rest of the system.

The in-process entities are renamed as `impl`, to suggest that they
are implementations of functionality provided by the
corresponding interfaces.

Bug: 1121297
Change-Id: I50a62fb19d56e455cd9e001b7642cef85f114e3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490677Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819919}