Remove an unnecessary debug output.

Change-Id: If92bf1e3908257c4c0cd68d041b122404e301e08

tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java

@@ -155,7 +155,6 @@ public class UserHistoryDictionaryTests extends AndroidTestCase {
             Log.d(TAG, "testStressTestForSwitchingLanguageAndAddingWords took "
                     + (end - start) + " ms");
         } finally {
-            Log.d(TAG, "waiting for writing ...");
             try {
                 Log.d(TAG, "waiting for writing ...");
                 Thread.sleep(TimeUnit.MILLISECONDS.convert(5L, TimeUnit.SECONDS));