Match semantics of ArrayList#toArray in Config's use thereof

BUG: 28706561
Change-Id: Ia8b5a126ab742f02cf2e1f83294d8488b133a822
diff --git a/src/com/android/bluetooth/btservice/Config.java b/src/com/android/bluetooth/btservice/Config.java
index 93da040..7a9de21 100644
--- a/src/com/android/bluetooth/btservice/Config.java
+++ b/src/com/android/bluetooth/btservice/Config.java
@@ -101,9 +101,7 @@
                 profiles.add(PROFILE_SERVICES[i]);
             }
         }
-        int totalProfiles = profiles.size();
-        SUPPORTED_PROFILES = new Class[totalProfiles];
-        profiles.toArray(SUPPORTED_PROFILES);
+        SUPPORTED_PROFILES = profiles.toArray(new Class[profiles.size()]);
     }
 
     static Class[]  getSupportedProfiles() {