Fix {virtual,override,final} build failure on official CrOS build

chrome/browser/rlz/rlz_unittest.cc

 // 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.
 
 #include "chrome/browser/rlz/rlz.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/browser/autocomplete/autocomplete_controller.h"
@@ skipping 119 matching lines @@
 
   bool ScheduleGetAccessPointRlz(rlz_lib::AccessPoint point) override {
     return !assume_not_ui_thread_;
   }
 
   bool ScheduleRecordFirstSearch(rlz_lib::AccessPoint point) override {
     return !assume_not_ui_thread_;
   }
 
 #if defined(OS_CHROMEOS)
-  virtual bool ScheduleClearRlzState() override {
+  bool ScheduleClearRlzState() override {
     return !assume_not_ui_thread_;
   }
 #endif
 
   bool SendFinancialPing(const std::string& brand,
                                  const base::string16& lang,
                                  const base::string16& referral) override {
     // Don't ping the server during tests, just pretend as if we did.
     EXPECT_FALSE(brand.empty());
     pinged_brands_.insert(brand);
@@ skipping 755 matching lines @@
   RLZTracker::RecordProductEvent(rlz_lib::CHROME, RLZTracker::ChromeOmnibox(),
                                  rlz_lib::FIRST_SEARCH);
 
   ExpectEventRecorded(kOmniboxFirstSearch, true);
 
   RLZTracker::ClearRlzState();
 
   ExpectEventRecorded(kOmniboxFirstSearch, false);
 }
 #endif  // defined(OS_CHROMEOS)