Rename DexJar interface method to DexJarBuildPath.

This is a prerequisite change before adding DexJarInstallPath.

Test: lunch aosp_cf_phone-userdebug && m
Change-Id: I033e08b8bb06c0a844a6bbbfcdc48ce33e9c95cf
diff --git a/java/app.go b/java/app.go
index a45ab6f..fb02c99 100755
--- a/java/app.go
+++ b/java/app.go
@@ -1882,7 +1882,7 @@
 	if !ctx.Config().UnbundledBuild() {
 		ctx.VisitDirectDepsWithTag(usesLibTag, func(m android.Module) {
 			if lib, ok := m.(Dependency); ok {
-				if dexJar := lib.DexJar(); dexJar != nil {
+				if dexJar := lib.DexJarBuildPath(); dexJar != nil {
 					usesLibPaths[ctx.OtherModuleName(m)] = dexJar
 				} else {
 					ctx.ModuleErrorf("module %q in uses_libs or optional_uses_libs must produce a dex jar, does it have installable: true?",