Remove apex.use_file_contexts_as_is

It was a workaround to build a vendor apex which needs to read
apex_manifest and run on SDK 34, which doesn't have
vendor_apex_metadata_file yet.

Vendor_apex_metadata_file is available since SDK 35, we can remove
the workaround.

Bug: 388964457
Test: m --no-skip-soong-tests
Change-Id: Iad91bee7c689c96322e342485301152739baa92a
diff --git a/apex/builder.go b/apex/builder.go
index d9348c5..641aa27 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -426,8 +426,6 @@
 		ctx.PropertyErrorf("file_contexts", "cannot find file_contexts file: %q", fileContexts.String())
 	}
 
-	useFileContextsAsIs := proptools.Bool(a.properties.Use_file_contexts_as_is)
-
 	output := android.PathForModuleOut(ctx, "file_contexts")
 	rule := android.NewRuleBuilder(pctx, ctx)
 
@@ -444,11 +442,9 @@
 	rule.Command().Text("cat").Input(fileContexts).Text(">>").Output(output)
 	// new line
 	rule.Command().Text("echo").Text(">>").Output(output)
-	if !useFileContextsAsIs {
-		// force-label /apex_manifest.pb and /
-		rule.Command().Text("echo").Text("/apex_manifest\\\\.pb").Text(labelForManifest).Text(">>").Output(output)
-		rule.Command().Text("echo").Text("/").Text(labelForRoot).Text(">>").Output(output)
-	}
+	// force-label /apex_manifest.pb and /
+	rule.Command().Text("echo").Text("/apex_manifest\\\\.pb").Text(labelForManifest).Text(">>").Output(output)
+	rule.Command().Text("echo").Text("/").Text(labelForRoot).Text(">>").Output(output)
 
 	rule.Build("file_contexts."+a.Name(), "Generate file_contexts")
 	return output