Update DepSet references

Update all references to depset to use blueprint/depset, and to use
DepSet instead of *DepSet.

Bug: 375276086
Test: all soong tests pass
Flag: EXEMPT refactor
Change-Id: I59a7836d0975366ddc336225fb770ac7e6e0c8ea
diff --git a/java/dex.go b/java/dex.go
index a3f699b..fffa55e 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -324,20 +324,16 @@
 	r8Deps = append(r8Deps, flags.dexClasspath...)
 
 	transitiveStaticLibsLookupMap := map[android.Path]bool{}
-	if d.transitiveStaticLibsHeaderJarsForR8 != nil {
-		for _, jar := range d.transitiveStaticLibsHeaderJarsForR8.ToList() {
-			transitiveStaticLibsLookupMap[jar] = true
-		}
+	for _, jar := range d.transitiveStaticLibsHeaderJarsForR8.ToList() {
+		transitiveStaticLibsLookupMap[jar] = true
 	}
 	transitiveHeaderJars := android.Paths{}
-	if d.transitiveLibsHeaderJarsForR8 != nil {
-		for _, jar := range d.transitiveLibsHeaderJarsForR8.ToList() {
-			if _, ok := transitiveStaticLibsLookupMap[jar]; ok {
-				// don't include a lib if it is already packaged in the current JAR as a static lib
-				continue
-			}
-			transitiveHeaderJars = append(transitiveHeaderJars, jar)
+	for _, jar := range d.transitiveLibsHeaderJarsForR8.ToList() {
+		if _, ok := transitiveStaticLibsLookupMap[jar]; ok {
+			// don't include a lib if it is already packaged in the current JAR as a static lib
+			continue
 		}
+		transitiveHeaderJars = append(transitiveHeaderJars, jar)
 	}
 	transitiveClasspath := classpath(transitiveHeaderJars)
 	r8Flags = append(r8Flags, transitiveClasspath.FormJavaClassPath("-libraryjars"))