Fix GlobalSyntheticsGenerator CLI for writing files

Change-Id: I22ff048cc88f3bcbed8b221b80a7d5199f9aeeb3
diff --git a/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java b/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
index 5cc177b..fbfbc0a 100644
--- a/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
+++ b/src/main/java/com/android/tools/r8/GlobalSyntheticsGeneratorCommand.java
@@ -23,7 +23,6 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.StandardOpenOption;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Set;
@@ -272,7 +271,7 @@
               }
               written = true;
               try {
-                Files.write(path, data.copyByteData(), StandardOpenOption.TRUNCATE_EXISTING);
+                Files.write(path, data.copyByteData());
               } catch (IOException e) {
                 throw new RuntimeException(e);
               }