Fix RLZ ID generation to be 50 char and slightly more robust.

chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java
index 4ed88a7ce907f0f9b78abc78a10cdacd8c267a20..b6ab1f8e1c5892f3e673ccffecb4f0fb52ac22bc 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/rlz/RlzPingHandler.java
@@ -38,12 +38,20 @@ public class RlzPingHandler {
         String id =
                 new SettingsSecureBasedIdentificationGenerator(ContextUtils.getApplicationContext())
                         .getUniqueId(ID_SALT);
-        id = id + id.substring(0, 50 - id.length() - 1);
+        id = generate50CharacterId(id);
 
         nativeStartPing(Profile.getLastUsedProfile().getOriginalProfile(), brand,
                 Locale.getDefault().getLanguage(), TextUtils.join(",", events), id, callback);
     }
 
+    private static String generate50CharacterId(String baseId) {
+        StringBuilder idBuilder = new StringBuilder();
+        while (idBuilder.length() < 50) {
+            idBuilder.append(baseId);
+        }
+        return idBuilder.substring(0, 50);
+    }
+
     private static native void nativeStartPing(Profile profile, String brand, String language,
             String events, String id, Callback<Boolean> callback);
 }