This reverts commit 1d54425457.
Reason for revert: Causes virtual/cache-storage-parallel/external/wpt/service-workers/service-worker/interfaces-sw.https.html to time out on Linux MSAN.
Original change's description:
> Reland "CacheStorage: Allow reads to be executed in parallel."
>
> This is a reland of cca6943d4d
>
> Original change's description:
> > CacheStorage: Allow reads to be executed in parallel.
> >
> > This CL adds the CacheStorageParallelOps feature with the associated
> > "max_shared_ops" parameter. Enabling the feature and setting the
> > parameter to greater than one will allow read-only cache_storage
> > operations to run in parallel. By default parallel operation is
> > disabled.
> >
> > The overall design is to treat each CacheStorageScheduler as if it
> > has its own read-write-lock. When an operation is scheduled it must
> > be flagged as either "shared" or "exclusive". Some number of shared
> > operations (determined by the feature param) may run in parallel.
> > Exclusive operations always run by themselves without parallelism.
> >
> > This CL also includes the ServiceWorkerCache.PeakParallelSharedOps
> > histogram which will measure how much parallelism we actually see in
> > practice. The peak is measured across a small time period defined by
> > when an idle scheduler begins running its first shared op to until it
> > stops running all shared ops.
> >
> > Bug: 985379
> > Change-Id: I4e318b719b51da079ff584acd1fb398d898660d7
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709008
> > Reviewed-by: Jesse Doherty <jwd@chromium.org>
> > Reviewed-by: Daniel Murphy <dmurph@chromium.org>
> > Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> > Reviewed-by: Rayan Kanso <rayankans@chromium.org>
> > Commit-Queue: Ben Kelly <wanderview@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#680986}
>
> TBR=jwd@chromium.org,dmurph@chromium.org,jam@chromium.org,rayankans@chromium.org
>
> Bug: 985379
> Change-Id: I83d8ce38a647b00e658dc1e2e17828468475cc66
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737031
> Reviewed-by: Ben Kelly <wanderview@chromium.org>
> Commit-Queue: Ben Kelly <wanderview@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#684049}
TBR=dmurph@chromium.org,jwd@chromium.org,jam@chromium.org,rayankans@chromium.org,wanderview@chromium.org
Change-Id: I879f85342779a56f445cb6a157aeb5d74fcd3771
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 985379
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1738591
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684330}
da579410e4