Add OVERRIDE to base/.

base/file_descriptor_shuffle.h

Index: base/file_descriptor_shuffle.h
diff --git a/base/file_descriptor_shuffle.h b/base/file_descriptor_shuffle.h
index 335b008acdb2c1ec725ef17a254a8747050503fb..61aac694bd8ec853d2726b831decbb8a92a82be8 100644
--- a/base/file_descriptor_shuffle.h
+++ b/base/file_descriptor_shuffle.h
@@ -25,6 +25,7 @@
 #include <vector>
 
 #include "base/base_export.h"
+#include "base/compiler_specific.h"
 
 namespace base {
 
@@ -48,9 +49,9 @@ class InjectionDelegate {
 // An implementation of the InjectionDelegate interface using the file
 // descriptor table of the current process as the domain.
 class FileDescriptorTableInjection : public InjectionDelegate {
-  virtual bool Duplicate(int* result, int fd);
-  virtual bool Move(int src, int dest);
-  virtual void Close(int fd);
+  virtual bool Duplicate(int* result, int fd) OVERRIDE;
+  virtual bool Move(int src, int dest) OVERRIDE;
+  virtual void Close(int fd) OVERRIDE;
 };
 
 // A single arc of the directed graph which describes an injective multimapping.