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This CL moves mock_logger.* from chrome/browser/ to components/ so that
it can be reused by mirroring service tests in components/ directory.
Mirroring service tests will be changed in a later CL.

Bug: b/165366974, 1117673
Change-Id: I225de779b0caa476fd253b56e0ecc10f16e13688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2482092Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Muyao Xu <muyaoxu@google.com>
Cr-Commit-Position: refs/heads/master@{#820315}