Messaging: Language cleanup

No unnecessary boxing, enhanced for loops, redundant checks and throws,
imports (removal, reordering), possible void returns

Change-Id: I7a8e1b2007e3b0906e01b41785c518d02c2f3fab

src/com/android/messaging/sms/BugleApnSettingsLoader.java

@@ -359,7 +359,7 @@ public class BugleApnSettingsLoader implements ApnSettingsLoader {
         } else {
             uri = Telephony.Carriers.CONTENT_URI;
         }
-        Cursor cursor = null;
+        Cursor cursor;
         try {
             for (; ; ) {
                 // Try different combinations of queries. Some would work on some platforms.
@@ -556,7 +556,7 @@ public class BugleApnSettingsLoader implements ApnSettingsLoader {
             return addr;
         }
         final StringBuilder builder = new StringBuilder(16);
-        String result = null;
+        String result;
         for (int i = 0; i < 4; i++) {
             try {
                 if (octets[i].length() > 3) {