internal: delete unused WithSymbols fieldset

Change-Id: I0441003b053a096364d2a1458c69b5ebc81ce375
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/310379
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/internal/postgres/unit.go b/internal/postgres/unit.go
index ce98ec2..8444852 100644
--- a/internal/postgres/unit.go
+++ b/internal/postgres/unit.go
@@ -234,8 +234,7 @@
 		}
 	}
 	if fields&internal.WithImports == 0 &&
-		fields&internal.WithLicenses == 0 &&
-		fields&internal.WithSymbols == 0 {
+		fields&internal.WithLicenses == 0 {
 		return u, nil
 	}
 
@@ -245,16 +244,6 @@
 		return nil, err
 	}
 
-	if fields&internal.WithSymbols != 0 {
-		symbols, err := getUnitSymbols(ctx, db.db, unitID)
-		if err != nil {
-			return nil, err
-		}
-		// Return nil if there are no symbols, instead of an empty map.
-		if len(u.Symbols) > 0 {
-			u.Symbols = symbols
-		}
-	}
 	if fields&internal.WithImports != 0 {
 		imports, err := db.getImports(ctx, unitID)
 		if err != nil {
diff --git a/internal/unit.go b/internal/unit.go
index cde47b4..caa458f 100644
--- a/internal/unit.go
+++ b/internal/unit.go
@@ -108,5 +108,4 @@
 	WithMain FieldSet = 1 << iota
 	WithImports
 	WithLicenses
-	WithSymbols
 )