Standardize usage of virtual/override/final in base/

base/memory/scoped_ptr_unittest.cc

Index: base/memory/scoped_ptr_unittest.cc
diff --git a/base/memory/scoped_ptr_unittest.cc b/base/memory/scoped_ptr_unittest.cc
index 3da8d3bd708ffebfafc178a8dad23ddb1b06c56b..6af19b6d65a3577ce3d87d545fa8ed0a49a4ede0 100644
--- a/base/memory/scoped_ptr_unittest.cc
+++ b/base/memory/scoped_ptr_unittest.cc
@@ -25,11 +25,14 @@ class ConDecLogger : public ConDecLoggerParent {
  public:
   ConDecLogger() : ptr_(NULL) { }
   explicit ConDecLogger(int* ptr) { SetPtr(ptr); }
-  virtual ~ConDecLogger() { --*ptr_; }
+  ~ConDecLogger() override { --*ptr_; }
 
-  virtual void SetPtr(int* ptr) override { ptr_ = ptr; ++*ptr_; }
+  void SetPtr(int* ptr) override {
+    ptr_ = ptr;
+    ++*ptr_;
+  }
 
-  virtual int SomeMeth(int x) const override { return x; }
+  int SomeMeth(int x) const override { return x; }
 
  private:
   int* ptr_;