Remove option to create boot image based on preloaded classes

From now on, the only supported approach is to use a boot image profile.

Test: make

Change-Id: Ibd8fbd1dd81db0a7b3f3b3e626a70dcc26510224
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index eb735c1..4758c7e 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -286,8 +286,6 @@
 	if profile != nil {
 		cmd.FlagWithArg("--compiler-filter=", "speed-profile")
 		cmd.FlagWithInput("--profile-file=", profile)
-	} else if global.PreloadedClasses.Valid() {
-		cmd.FlagWithInput("--image-classes=", global.PreloadedClasses.Path())
 	}
 
 	if global.DirtyImageObjects.Valid() {
@@ -374,7 +372,7 @@
 func bootImageProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
 	global := dexpreoptGlobalConfig(ctx)
 
-	if !global.UseProfileForBootImage || ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
+	if ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
 		return nil
 	}
 	return ctx.Config().Once(bootImageProfileRuleKey, func() interface{} {