Make SyncStartupTracker::Observer destructor virtual

chrome/browser/sync/sync_startup_tracker_unittest.cc

 // Copyright (c) 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.
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/sync/profile_sync_service_mock.h"
 #include "chrome/browser/sync/sync_startup_tracker.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::Mock;
 using ::testing::Return;
 using ::testing::ReturnRef;
 
 namespace {
 
 class MockObserver : public SyncStartupTracker::Observer {
  public:
-  MockObserver() {}
-  ~MockObserver() {}
-
   MOCK_METHOD0(SyncStartupCompleted, void(void));
   MOCK_METHOD0(SyncStartupFailed, void(void));
 };
 
 class SyncStartupTrackerTest : public testing::Test {
  public:
   SyncStartupTrackerTest() :
       no_error_(GoogleServiceAuthError::NONE) {
   }
   virtual void SetUp() OVERRIDE {
@@ skipping 113 matching lines @@
   EXPECT_CALL(*mock_pss_, IsSyncEnabledAndLoggedIn()).WillRepeatedly(
       Return(true));
   GoogleServiceAuthError error(
       GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS);
   EXPECT_CALL(*mock_pss_, GetAuthError()).WillRepeatedly(ReturnRef(error));
   EXPECT_CALL(observer_, SyncStartupFailed());
   tracker.OnStateChanged();
 }
 
 }  // namespace