Fix VarHandle test on Windows

Bug: b/247076137
Change-Id: I4652a99558c6a6ac3739d07945c52074aa7bbf16
diff --git a/src/test/java/com/android/tools/r8/cf/varhandle/VarHandleDesugaringInstanceObjectFieldTest.java b/src/test/java/com/android/tools/r8/cf/varhandle/VarHandleDesugaringInstanceObjectFieldTest.java
index 3ee2797..ac43573 100644
--- a/src/test/java/com/android/tools/r8/cf/varhandle/VarHandleDesugaringInstanceObjectFieldTest.java
+++ b/src/test/java/com/android/tools/r8/cf/varhandle/VarHandleDesugaringInstanceObjectFieldTest.java
@@ -138,19 +138,14 @@
 
   @Override
   protected String getExpectedOutputForReferenceImplementation() {
-    String expectedOutputWithoutNewLine =
-        EXPECTED_OUTPUT.substring(0, EXPECTED_OUTPUT.length() - 1);
     return StringUtils.lines(
-        expectedOutputWithoutNewLine, "Reference implementation", "Reference implementation");
+        EXPECTED_OUTPUT.trim(), "Reference implementation", "Reference implementation");
   }
 
   @Override
   protected String getExpectedOutputForArtImplementation() {
     assert parameters.isDexRuntime();
-    String expectedOutputWithoutNewLine =
-        EXPECTED_OUTPUT.substring(0, EXPECTED_OUTPUT.length() - 1);
-    return StringUtils.lines(
-        expectedOutputWithoutNewLine, "Art implementation", "Art implementation");
+    return StringUtils.lines(EXPECTED_OUTPUT.trim(), "Art implementation", "Art implementation");
   }
 
   @Override