Reenable StringToStringTest.

This should have been part of https://r8-review.googlesource.com/30620

Bug: 119399513, 118912005
Change-Id: I0807c7c79359fc2e8410b9acb74b3d142a7cf9d2
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/string/StringToStringTest.java b/src/test/java/com/android/tools/r8/ir/optimize/string/StringToStringTest.java
index a9cf86e..bd7bb01 100644
--- a/src/test/java/com/android/tools/r8/ir/optimize/string/StringToStringTest.java
+++ b/src/test/java/com/android/tools/r8/ir/optimize/string/StringToStringTest.java
@@ -20,7 +20,6 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Streams;
 import java.util.List;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
@@ -104,7 +103,6 @@
   }
 
   @Test
-  @Ignore("b/119399513")
   public void testD8() throws Exception {
     assumeTrue("Only run D8 for Dex backend", backend == Backend.DEX);
 
@@ -124,7 +122,6 @@
   }
 
   @Test
-  @Ignore("b/119399513")
   public void testR8() throws Exception {
     TestRunResult result = testForR8(backend)
         .addProgramClasses(CLASSES)