Align CacheStorageSequenceChromeOS fieldtrial_testing_config to new trial params.

Bug: 960012
Change-Id: I1852e992c7573845e0ddb8ccc24e1f4a0254ed1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387177Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804015}

testing/variations/fieldtrial_testing_config.json

@@ -986,12 +986,12 @@
             ],
             "experiments": [
                 {
-                    "name": "Enabled8_v4",
+                    "name": "Enabled6_v7",
                     "params": {
-                        "max_shared_ops": "8"
+                        "min": "6"
                     },
                     "enable_features": [
-                        "CacheStorageParallelOps",
+                        "BrowserThreadPoolAdjustment",
                         "CacheStorageSequence"
                     ]
                 }