Unlink an old file before moving the new file over it

This is unlikely to be relevant to this bug, but just in case.

Bug: 7274972
Change-Id: I56b31b377af16cc2c15ceb90a19792bed3aab367

java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java

@@ -200,6 +200,7 @@ public final class BinaryDictionaryFileDumper {
                 outputStream.flush();
                 outputStream.close();
                 final File finalFile = new File(finalFileName);
+                finalFile.delete();
                 if (!outputFile.renameTo(finalFile)) {
                     throw new IOException("Can't move the file to its final name");
                 }