Consistently use only one of virtual/OVERRIDE/FINAL.

src/base/platform/time.cc

Index: src/base/platform/time.cc
diff --git a/src/base/platform/time.cc b/src/base/platform/time.cc
index d47ccaf8035863d63abccc6ef39cd8825fac794f..40dd188db362c2b2d2018c6892a1b5b9fa378f80 100644
--- a/src/base/platform/time.cc
+++ b/src/base/platform/time.cc
@@ -401,7 +401,7 @@ class HighResolutionTickClock FINAL : public TickClock {
   }
   virtual ~HighResolutionTickClock() {}
 
-  virtual int64_t Now() OVERRIDE {
+  int64_t Now() OVERRIDE {
     LARGE_INTEGER now;
     BOOL result = QueryPerformanceCounter(&now);
     DCHECK(result);
@@ -419,9 +419,7 @@ class HighResolutionTickClock FINAL : public TickClock {
     return ticks + 1;
   }
 
-  virtual bool IsHighResolution() OVERRIDE {
-    return true;
-  }
+  bool IsHighResolution() OVERRIDE { return true; }
 
  private:
   int64_t ticks_per_second_;
@@ -435,7 +433,7 @@ class RolloverProtectedTickClock FINAL : public TickClock {
   RolloverProtectedTickClock() : last_seen_now_(0), rollover_ms_(1) {}
   virtual ~RolloverProtectedTickClock() {}
 
-  virtual int64_t Now() OVERRIDE {
+  int64_t Now() OVERRIDE {
     LockGuard<Mutex> lock_guard(&mutex_);
     // We use timeGetTime() to implement TimeTicks::Now(), which rolls over
     // every ~49.7 days. We try to track rollover ourselves, which works if
@@ -454,9 +452,7 @@ class RolloverProtectedTickClock FINAL : public TickClock {
     return (now + rollover_ms_) * Time::kMicrosecondsPerMillisecond;
   }
 
-  virtual bool IsHighResolution() OVERRIDE {
-    return false;
-  }
+  bool IsHighResolution() OVERRIDE { return false; }
 
  private:
   Mutex mutex_;