remove import

Author: szakarias

app/lib/service/download_counts/package_trends.dart

@@ -98,7 +98,7 @@ double computeTrendScore(List<int> totalDownloads) {
 List<double> safeLogTransform(List<int> numbers) {
   double myLog(int number) {
     if (number <= 0) {
-      return log(1); // 0.0
+      return 0.0;
     }
     return log(number);
   }

app/test/service/download_counts/package_trends_test.dart

@@ -2,8 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:math';
-
 import 'package:pub_dev/service/download_counts/package_trends.dart';
 import 'package:test/test.dart';