replace 'virtual ... OVERRIDE' with '... override'

base/debug/trace_event_synthetic_delay.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/debug/trace_event_synthetic_delay.h"
 #include "base/memory/singleton.h"
 
 namespace {
 const int kMaxSyntheticDelays = 32;
 }  // namespace
 
 namespace base {
 namespace debug {
 
 TraceEventSyntheticDelayClock::TraceEventSyntheticDelayClock() {}
 TraceEventSyntheticDelayClock::~TraceEventSyntheticDelayClock() {}
 
 class TraceEventSyntheticDelayRegistry : public TraceEventSyntheticDelayClock {
  public:
   static TraceEventSyntheticDelayRegistry* GetInstance();
 
   TraceEventSyntheticDelay* GetOrCreateDelay(const char* name);
   void ResetAllDelays();
 
   // TraceEventSyntheticDelayClock implementation.
-  virtual base::TimeTicks Now() OVERRIDE;
+  base::TimeTicks Now() override;
 
  private:
   TraceEventSyntheticDelayRegistry();
 
   friend struct DefaultSingletonTraits<TraceEventSyntheticDelayRegistry>;
 
   Lock lock_;
   TraceEventSyntheticDelay delays_[kMaxSyntheticDelays];
   TraceEventSyntheticDelay dummy_delay_;
   base::subtle::Atomic32 delay_count_;
@@ skipping 187 matching lines @@
   if (!delay_impl) {
     delay_impl = base::debug::TraceEventSyntheticDelayRegistry::GetInstance()
                      ->GetOrCreateDelay(name);
     base::subtle::Release_Store(
         impl_ptr, reinterpret_cast<base::subtle::AtomicWord>(delay_impl));
   }
   return delay_impl;
 }
 
 }  // namespace trace_event_internal