Remove unused variable in ReportingCacheImpl

Bug: chromium:1200729
Change-Id: I6399103fcf2c26d493706db2398566219afab004
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2837974
Reviewed-by: Lily Chen <chlily@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#874240}
GitOrigin-RevId: 5949ac9f23fff638ecf455a3f0fa9ff1324da7ef
1 file changed