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/apex.go b/apex/apex.go
index d39a17f..3d8baa6 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -83,10 +83,6 @@
 	// /system/sepolicy/apex/<module_name>_file_contexts.
 	File_contexts *string `android:"path"`
 
-	// By default, file_contexts is amended by force-labelling / and /apex_manifest.pb as system_file
-	// to avoid mistakes. When set as true, no force-labelling.
-	Use_file_contexts_as_is *bool
-
 	// Path to the canned fs config file for customizing file's
 	// uid/gid/mod/capabilities. The content of this file is appended to the
 	// default config, so that the custom entries are preferred. The format is
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