experimental: Rename struct SyncgroupPrefix to a more generic 'TableRow'

Based on changes in https://vanadium-review.googlesource.com/#/c/16928/

MultiPart: 2/2

Change-Id: Ib9994734ca736529b6059aeaa80bee80cb20c5c7
diff --git a/go/src/v.io/x/sensorlog/internal/measure/syncgroup.go b/go/src/v.io/x/sensorlog/internal/measure/syncgroup.go
index 1aaa9a9..1ee3909 100644
--- a/go/src/v.io/x/sensorlog/internal/measure/syncgroup.go
+++ b/go/src/v.io/x/sensorlog/internal/measure/syncgroup.go
@@ -50,13 +50,13 @@
 	sbutil.AddPermsForPattern(&sgAcl, admin, access.AllTypicalTags()...)
 
 	// Maps all syncgroup prefixes to ACLs.
-	prefixSpec := make(map[nosql_wire.SyncgroupPrefix]access.Permissions)
+	prefixSpec := make(map[nosql_wire.TableRow]access.Permissions)
 
 	// StreamDef : <devId>
 	// Admin client has full permissions, measured drops to readonly.
-	prefixStreamDef := nosql_wire.SyncgroupPrefix{
+	prefixStreamDef := nosql_wire.TableRow{
 		TableName: sbmodel.KStreamDef{}.Table(),
-		RowPrefix: devId,
+		Row: devId,
 	}
 	aclStreamDef := access.Permissions{}
 	sbutil.AddPermsForPrincipal(&aclStreamDef, v23.GetPrincipal(ctx), access.Resolve, access.Read)
@@ -65,20 +65,20 @@
 
 	// DataPoint : <devId>
 	// Admin client has full permissions, measured drops to read/write.
-	prefixDataPoint := nosql_wire.SyncgroupPrefix{
+	prefixDataPoint := nosql_wire.TableRow{
 		TableName: sbmodel.KDataPoint{}.Table(),
-		RowPrefix: devId,
+		Row: devId,
 	}
 	aclDataPoint := access.Permissions{}
 	sbutil.AddPermsForPrincipal(&aclDataPoint, v23.GetPrincipal(ctx), access.Resolve, access.Read, access.Write)
 	sbutil.AddPermsForPattern(&aclDataPoint, admin, access.AllTypicalTags()...)
 	prefixSpec[prefixDataPoint] = aclDataPoint
 
-	var prefixes []nosql_wire.SyncgroupPrefix
+	var prefixes []nosql_wire.TableRow
 	// Apply prefix ACLs to all syncgroup prefixes.
 	for prefix, prefixAcl := range prefixSpec {
 		// Ignore ErrNoAccess, assume we already dropped permissions.
-		err := db.Table(prefix.TableName).SetPrefixPermissions(ctx, nosql.Prefix(prefix.RowPrefix), prefixAcl)
+		err := db.Table(prefix.TableName).SetPrefixPermissions(ctx, nosql.Prefix(prefix.Row), prefixAcl)
 		if err != nil && verror.ErrorID(err) != verror.ErrNoAccess.ID {
 			return err
 		}