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/platform_bootclasspath.go b/java/platform_bootclasspath.go
index 5bb7754..acfc774 100644
--- a/java/platform_bootclasspath.go
+++ b/java/platform_bootclasspath.go
@@ -191,9 +191,7 @@
 	var transitiveSrcFiles android.Paths
 	for _, module := range append(allModules, implLibModule...) {
 		if depInfo, ok := android.OtherModuleProvider(ctx, module, JavaInfoProvider); ok {
-			if depInfo.TransitiveSrcFiles != nil {
-				transitiveSrcFiles = append(transitiveSrcFiles, depInfo.TransitiveSrcFiles.ToList()...)
-			}
+			transitiveSrcFiles = append(transitiveSrcFiles, depInfo.TransitiveSrcFiles.ToList()...)
 		}
 	}
 	jarArgs := resourcePathsToJarArgs(transitiveSrcFiles)