Make use of try with-resources to auto close file.

PiperOrigin-RevId: 412901581

libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/AndroidTestUtil.java

@@ -117,7 +117,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
       throws IOException {
     File analysisFile =
         createExternalCacheFile(context, /* fileName= */ result.testId + "-result.txt");
-    FileWriter fileWriter = new FileWriter(analysisFile);
+    try (FileWriter fileWriter = new FileWriter(analysisFile)) {
       String fileContents =
           "test="
               + result.testId
@@ -129,10 +129,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
               + Build.VERSION.SDK_INT
               + ", outputSizeBytes="
               + result.outputSizeBytes;
-    try {
       fileWriter.write(fileContents);
-    } finally {
-      fileWriter.close();
     }
   }