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

base/debug/trace_event_synthetic_delay_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/debug/trace_event_synthetic_delay.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace debug {
 namespace {
 
 const int kTargetDurationMs = 100;
 // Allow some leeway in timings to make it possible to run these tests with a
 // wall clock time source too.
 const int kShortDurationMs = 10;
 
 }  // namespace
 
 class TraceEventSyntheticDelayTest : public testing::Test,
                                      public TraceEventSyntheticDelayClock {
  public:
   TraceEventSyntheticDelayTest() {}
-  virtual ~TraceEventSyntheticDelayTest() {
-    ResetTraceEventSyntheticDelays();
-  }
+  ~TraceEventSyntheticDelayTest() override { ResetTraceEventSyntheticDelays(); }
 
   // TraceEventSyntheticDelayClock implementation.
   base::TimeTicks Now() override {
     AdvanceTime(base::TimeDelta::FromMilliseconds(kShortDurationMs / 10));
     return now_;
   }
 
   TraceEventSyntheticDelay* ConfigureDelay(const char* name) {
     TraceEventSyntheticDelay* delay = TraceEventSyntheticDelay::Lookup(name);
     delay->SetClock(this);
@@ skipping 110 matching lines @@
   delay->EndParallel(end_times[0]);
   EXPECT_GE((Now() - start_time).InMilliseconds(), kTargetDurationMs);
 
   start_time = Now();
   delay->EndParallel(end_times[1]);
   EXPECT_LT((Now() - start_time).InMilliseconds(), kShortDurationMs);
 }
 
 }  // namespace debug
 }  // namespace base