Get ride of chrome.storage.* data when removing an application.

chrome/test/data/extensions/platform_apps/reinstall_data_cleanup/test.js

+// Copyright 2013 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.
+
+function testChromeStorage(backend, callback) {
+  backend.get('foo', chrome.test.callbackPass(function(result) {
+    chrome.test.assertEq(undefined, result.foo,
+                         'no value should have been found');
+    chrome.test.assertEq(undefined, chrome.runtime.lastError);
+
+    // We set the value but also want to make sure it is correctly saved.
+    backend.set({ 'foo': 'bar' }, chrome.test.callbackPass(function() {
+      backend.get('foo', chrome.test.callbackPass(function(result) {
+        chrome.test.assertEq('bar', result.foo, 'value should be written');
+      }));
+    }));
+  }));
+}
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.test.sendMessage('Launched', function() {
+    chrome.test.runTests([
+      function testChromeStorageLocal() {
+        testChromeStorage(chrome.storage.local);
+      },
+      function testChromeStorageSync() {
+        testChromeStorage(chrome.storage.sync);
+      }
+    ]);
+  });
+});