Fix from issues

MobileChromeApps#22

src/ios/CDVServiceWorker.m

@@ -282,7 +282,7 @@ - (void)createServiceWorkerFromScript:(NSString *)script
         [weakSelf.requestDelegates removeObjectForKey:requestId];
 
         // Convert the response body to base64.
-        NSData *data = [NSData dataFromBase64String:[response[@"body"] toString]];
+        NSData *data = [[NSData alloc] initWithBase64EncodedString:[response[@"body"] toString] options:0];
         JSValue *headers = response[@"headers"];
         NSString *mimeType = [headers[@"mimeType"] toString];
         NSString *encoding = @"utf-8";