Temporarily disable GC of local sync cache GUIDs

Crashes have been reported on Beta and and the implementation has been
refactored since (base::Value refactoring) so it's safest to just
disable the garbage-collection for one milestone.

Bug: 1029673,989340
Change-Id: Id2e062ba302a7ffea970964170c492b513a52b73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1945812
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720435}
1 file changed