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|BloomServerProxy| will handle all communication with the Bloom servers.

Bug: b/165356952
Tests: chromeos_components_unittests --gtest_filter="Bloom*.*"
Change-Id: I0fbcdf1c35b0a2f29ebb963a363ce51eeb742b28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364065
Commit-Queue: Jeroen Dhollander <jeroendh@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803519}