Add virtual and OVERRIDE to base/ implementation files

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 63125dbf49bb6f349d5e3231d582141e061fe19d..06c6a5058992858a41975d56e29c7083dfce2d1b 100644
--- a/base/memory/scoped_ptr_unittest.cc
+++ b/base/memory/scoped_ptr_unittest.cc
@@ -23,9 +23,9 @@ class ConDecLogger : public ConDecLoggerParent {
   explicit ConDecLogger(int* ptr) { set_ptr(ptr); }
   virtual ~ConDecLogger() { --*ptr_; }
 
-  virtual void set_ptr(int* ptr) { ptr_ = ptr; ++*ptr_; }
+  virtual void set_ptr(int* ptr) OVERRIDE { ptr_ = ptr; ++*ptr_; }
 
-  virtual int SomeMeth(int x) const { return x; }
+  virtual int SomeMeth(int x) const OVERRIDE { return x; }
 
  private:
   int* ptr_;