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There's no point in remembering very old cache GUIDs since features
anyway filter for recent devices, so let's implement a
garbage-collection logic for the cache GUIDs stored in prefs.

Bug: 989340
Change-Id: I1b1f84e3026471f8f687caa54922e2ea43bafaba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827435Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702052}