Rename 'harddisk' to 'fixed' for storage unit type

chrome/test/data/extensions/api_test/systeminfo/storage/test_storage_api.js

 // Copyright (c) 2012 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.
 
 // systemInfo.storage api test
 // browser_tests --gtest_filter=SystemInfoStorageApiTest.Storage
 chrome.systemInfo = chrome.experimental.systemInfo;
 
 // Testing data should be the same as that in system_info_storage_apitest.cc
 var testData = [
   { id: "0xbeaf", type: "unknown", capacity: 4098,
     availableCapacity: 1000, step: 0 },
-  { id: "/home", type: "harddisk", capacity: 4098,
+  { id: "/home", type: "fixed", capacity: 4098,
     availableCapacity: 1000, step: 10 },
-  { id: "/data", type: "harddisk", capacity: 10000,
+  { id: "/data", type: "fixed", capacity: 10000,
     availableCapacity: 1000, step: 4097 }
 ];
 
 chrome.test.runTests([
   function testGet() {
     chrome.systemInfo.storage.get(chrome.test.callbackPass(function(units) {
       chrome.test.assertTrue(units.length == 3);
       for (var i = 0; i < units.length; ++i) {
         chrome.test.assertEq(testData[i].id, units[i].id);
         chrome.test.assertEq(testData[i].type, units[i].type);
@@ skipping 24 matching lines @@
           chrome.test.fail("No matched storage id is found!");
 
         if (++numOfChangedEvent > 10) {
           chrome.systemInfo.storage.onAvailableCapacityChanged.removeListener(
             listener);
           setTimeout(callbackCompleted, 0);
         }
      });
    }
 ]);