Replace OVERRIDE->override and FINAL->final since we now require C++11.

src/base/platform/elapsed-timer.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_PLATFORM_ELAPSED_TIMER_H_
 #define V8_BASE_PLATFORM_ELAPSED_TIMER_H_
 
 #include "src/base/logging.h"
 #include "src/base/platform/time.h"
 
 namespace v8 {
 namespace base {
 
-class ElapsedTimer FINAL {
+class ElapsedTimer final {
  public:
 #ifdef DEBUG
   ElapsedTimer() : started_(false) {}
 #endif
 
   // Starts this timer. Once started a timer can be checked with
   // |Elapsed()| or |HasExpired()|, and may be restarted using |Restart()|.
   // This method must not be called on an already started timer.
   void Start() {
     DCHECK(!IsStarted());
@@ skipping 63 matching lines @@
 
   TimeTicks start_ticks_;
 #ifdef DEBUG
   bool started_;
 #endif
 };
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_PLATFORM_ELAPSED_TIMER_H_