Standardize usage of virtual/override/final specifiers in sync/.

sync/internal_api/protocol_event_buffer_unittest.cc

 // Copyright 2014 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 "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 #include "sync/internal_api/protocol_event_buffer.h"
 #include "sync/internal_api/public/events/poll_get_updates_request_event.h"
 #include "sync/internal_api/public/events/protocol_event.h"
 #include "sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
 class ProtocolEventBufferTest : public ::testing::Test {
  public:
   ProtocolEventBufferTest();
-  virtual ~ProtocolEventBufferTest();
+  ~ProtocolEventBufferTest() override;
 
   static scoped_ptr<ProtocolEvent> MakeTestEvent(int64 id);
   static bool HasId(const ProtocolEvent& event, int64 id);
 
  protected:
   ProtocolEventBuffer buffer_;
 };
 
 ProtocolEventBufferTest::ProtocolEventBufferTest() {}
 
@@ skipping 38 matching lines @@
 
   for (size_t i = 1; i < ProtocolEventBuffer::kBufferSize+1; ++i) {
     EXPECT_TRUE(
         HasId(*(buffered_events[i-1]), static_cast<int64>(i)));
   }
 
 }
 
 
 }  // namespace syncer