Move net.html import down into the modules that use it

Tools/GardeningServer/model/ct-commit-log.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
+<link rel="import" href="../lib/net.html">
 <link rel='import' href='ct-commit.html'>
-
 <link rel='import' href='ct-repositories.html'>
 
 <script>
 function CTCommitLog() {
   this.commits = {};
   this.firstRevision = {};
   this.lastRevision = {};
   this._repositories = new CTRepositories();
 }
 
@@ skipping 38 matching lines @@
       if (commit)
         commits.push(commit);
     } else {
       var url = this._repositories.repositories[repository].repositoryUrl;
       commits.push(CTCommit.createIncomplete(url, revision, repository));
     }
   }
   return commits;
 }
 </script>