Fix setting in chrome-public spanner config

- This setting adds an "AS OF SYSTEM TIME" to the sql query to retrieve paramsets which is not valid in spanner.

Bug: b/377531850
Change-Id: I977b397c19031f16f42ebe8df35adfe486afa37a
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/931783
Commit-Queue: Ashwin Verleker <ashwinpv@google.com>
Reviewed-by: Jeff Yoon <jeffyoon@google.com>
diff --git a/perf/configs/spanner/chrome-public.json b/perf/configs/spanner/chrome-public.json
index 09bbbcb..9e36689 100644
--- a/perf/configs/spanner/chrome-public.json
+++ b/perf/configs/spanner/chrome-public.json
@@ -25,8 +25,7 @@
     "data_store_config": {
         "datastore_type": "spanner",
         "connection_string": "postgresql://root@localhost:5432/chrome_pub?sslmode=disable",
-        "tile_size": 8192,
-        "enable_follower_reads": true
+        "tile_size": 8192
     },
     "ingestion_config": {
         "source_config": {