Bug 724328 - Bump Android Sync version to 0.5. r=rnewman

mobile/android/base/sync/net/SyncStorageRequest.java

@@ -176,7 +176,7 @@ public class SyncStorageRequest implements Resource {
     }
   }
 
-  public static String USER_AGENT = "Firefox AndroidSync 0.4";
+  public static String USER_AGENT = "Firefox AndroidSync 0.5";
   protected SyncResourceDelegate resourceDelegate;
   public SyncStorageRequestDelegate delegate;
   protected BaseResource resource;