[Cronet] Purge storage directory if version does not match

components/cronet/android/test/javatests/src/org/chromium/net/SdchTest.java

 // Copyright 2015 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.
 
 package org.chromium.net;
 
 import android.os.ConditionVariable;
 import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.test.util.Feature;
@@ skipping 260 matching lines @@
         TestUrlRequestCallback callback = new TestUrlRequestCallback();
         UrlRequest.Builder builder =
                 new UrlRequest.Builder(url, callback, callback.getExecutor(), cronetEngine);
         builder.build().start();
         callback.blockForDone();
         return callback;
     }
 
     // Returns whether a file contains a particular string.
     private boolean fileContainsString(String filename, String content) throws IOException {
-        BufferedReader reader = new BufferedReader(
-                new FileReader(CronetTestFramework.getTestStorage(getContext()) + "/" + filename));
+        BufferedReader reader = new BufferedReader(new FileReader(
+                CronetTestFramework.getTestStorage(getContext()) + "/prefs/" + filename));
         String line;
         while ((line = reader.readLine()) != null) {
             if (line.contains(content)) {
                 reader.close();
                 return true;
             }
         }
         reader.close();
         return false;
     }
 }