Use System line separator in Kotlin default value test.

Change-Id: Ie84528068742f581ac5bcb4a9b91b7fb78d93879
diff --git a/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_app/main.kt b/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_app/main.kt
index 9cb6039..08551b5 100644
--- a/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_app/main.kt
+++ b/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_app/main.kt
@@ -7,6 +7,6 @@
 
 fun main() {
   val m = mapOf("A" to "a", "B" to "b", "C" to "c")
-  val s = listOf("A", "B", "C").joinToString(separator = "\n")
+  val s = listOf("A", "B", "C").joinToString(separator = System.lineSeparator())
   println(s.applyMap(m))
 }
diff --git a/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_lib/lib.kt b/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_lib/lib.kt
index c76b5be..dafbdbf 100644
--- a/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_lib/lib.kt
+++ b/src/test/java/com/android/tools/r8/kotlin/metadata/default_value_lib/lib.kt
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 package com.android.tools.r8.kotlin.metadata.default_value_lib
 
-fun String.applyMap(map: Map<String, String>, separator: String = "\n") =
+fun String.applyMap(map: Map<String, String>, separator: String = System.lineSeparator()) =
   this.split(separator).joinToString(separator = separator) {
     if (map.containsKey(it)) map.getValue(it) else it
   }