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This patch splits the fakes and mocks into another test target in
preparation to use that target for the extension API tests.

Bug: b/143736397
Change-Id: Idea76fe4e69c90916e4a664d04ad4fd9e9b7f6dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032107Reviewed-by: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737268}