replace OVERRIDE and FINAL with override and final in base/

base/memory/discardable_memory_malloc.h

Index: base/memory/discardable_memory_malloc.h
diff --git a/base/memory/discardable_memory_malloc.h b/base/memory/discardable_memory_malloc.h
index 7729ce5c49b9e9c38bb1bc88e51fc279d81e564f..e22d51533b07480702030dd6591f218947af3479 100644
--- a/base/memory/discardable_memory_malloc.h
+++ b/base/memory/discardable_memory_malloc.h
@@ -18,9 +18,9 @@ class DiscardableMemoryMalloc : public DiscardableMemory {
   bool Initialize();
 
   // Overridden from DiscardableMemory:
-  virtual DiscardableMemoryLockStatus Lock() OVERRIDE;
-  virtual void Unlock() OVERRIDE;
-  virtual void* Memory() const OVERRIDE;
+  virtual DiscardableMemoryLockStatus Lock() override;
+  virtual void Unlock() override;
+  virtual void* Memory() const override;
 
  private:
   scoped_ptr<uint8, FreeDeleter> memory_;